Duplicate Charges and POS Disputes in Private Hospitals: Chargeback, Evidence and Application Guide (2026)

This article discusses refund options, evidence, and application strategies for private hospitals that charge the same amount twice, POS slip-invoice discrepancies, and the imposition of "refunds via coupon".

1) Where does the problem originate? (Most common scenarios)

Pricing in private hospitals is often based on a busy flow of items such as "registration-examination-tests-materials-package/procedure" running simultaneously. Errors or abuses in this flow usually manifest themselves in the following ways:

Double charging: This refers to being charged twice for the same service, including registration fees, examination fees, the same test, the same consumables/materials, or the same "package deal".
POS slip available, no invoice / invoice available, no slip: Payment appears to have been processed, but the hospital is not generating an invoice/statement; or an invoice has been issued but does not match the card transaction.
Imposing "check/coupon/service credit" instead of a refund: A "no cash refund, let's deduct it from the service" approach.
Provision-collection confusion: Failure to close the deposit/pre-authorization, and being told that it will be cancelled/voided but not actually done.
Lack of service breakdown / vague explanations: High charges with a single line like "material cost"; which product, how many units, and unit price are unclear.

The common thread running through these topics is this: proving a dispute largely hinges on document management. Proceeding with the correct documentation speeds up the restitution process and increases your negotiating power.

2) Legal basis: Considering the right to "document" and "return" together

A) Hospital's obligation to issue documents: Basis of the regulation

Private hospitals are required to provide certain documents free of charge upon patient request . For example, documents such as lists of medications and supplies (the cost of which is borne by the patient), test and imaging results, and discharge summaries are regulated to be provided free of charge.

In practice, this regulation requires the hospital to document the answer to the question, "What was the money collected for?" Without documentation, the claim of duplicate/incorrect collection becomes much stronger.

The regulation also clarifies the scope of certain charges (e.g., services included in the daily bed fee cannot be billed separately).

Note: This distinction becomes critical if your dispute is based on the terms of the package and its contents.

B) Service and additional fee breakdown for patients covered by SGK (Appendix-1/B) — evidence of paramount importance

For those covered by general health insurance (SGK), it is stipulated that certain contracted healthcare providers a document (Annex-1/B) upon discharge showing the services provided to the patient during inpatient treatment, and any additional fees, under specific conditions.

If you can obtain this document, proving duplicate/incorrect charges becomes incredibly easy: because list of services and additional charges .

C) Why is "coupon/service credit imposition" risky?

In consumer law, contractual terms that allow the seller/provider to retain payment if they fail to perform the service at all or properly are considered "unfair terms." The law includes examples of such unfair terms in its list of examples.

Therefore, imposing a unilateral "coupon" instead of a refundmay lead to arguments that it constitutes an unfair condition and restricts the consumer's right to choose, depending on the specific circumstances.

D) Right to "dispute" in card payments: Law No. 5464 (core basis)

In card payments, it is stipulated that disputes can be filed with the card issuer within 10 days of the due date of credit card transactions ; and the card issuer is obliged to respond to complaints and disputes with a reasoned explanation within 20 days

This provision strengthens the legal basis for the "bank objection" line. Furthermore, the law includes a definition of "receivable document" (document issued in case of return/cancellation); this logic underlies the technical background of POS refunds.

3) Quickly detect duplicate/incorrect charges: 15-minute checklist

The following check clarifies where the discrepancy arises in most cases:

Card transaction / bank statement: Transaction date – amount – merchant name – authorization code.
POS slip: Whether the same amount appears on two slips, slip dates.
Invoice/self-employment receipt/payment document: Are there item descriptions, or are they vague, like "material"?
Service record / patient procedure list: Can be requested via the Regulation and (if applicable) Annex-1/B.
Acceptance form / information/consent / price confirmation: Especially important for "package" claims.
Screenshots and correspondence: statements such as "We will issue a refund."

Practical tip: When the same item is purchased twice, the amounts are often exactly the same; sometimes one appears as a "deposit/pre-authorization". You can spot this difference in your bank transaction details.

4) POS slip available, no invoice / invoice available, no slip: Proof and refund strategy

Scenario 1: There's a POS slip but no invoice/statement

In this case, your goal is twofold:

(i) Request for documentation from the hospital: For which service/product was the invoice withdrawn? Private hospitals can provide certain documents free of charge upon request (e.g., list of expenses, test results, discharge summary).
(ii) Objection via bank line: "Expenditure objection" processes are initiated for reasons such as duplicate charges / inability to prove payment for the service / failure to fulfill a promised cancellation. The framework of objection and response obligations under Law No. 5464 is important.

Your advantage: If the hospital doesn't generate an invoice, the "basis for collection" weakens. This strengthens your hand in both refund negotiations and consumer claims.

Scenario 2: There's an invoice but no POS slip/transaction (or the amount is different)

Two possibilities arise here:

Accounting-POS integration error: An invoice may have been issued, but the payment may have been received on a different day/for a different amount/in a different transaction.
Partial collection/provision: Part provision, part withdrawal, etc.

The best course of action in this situation is a "payment statement" (showing which invoice was processed with which transaction code) and to obtain transaction details from the bank.

5) An approach against the "no refunds, we'll give you a coupon" ultimatum

Private hospitals sometimes use the following defenses:

"We can't issue a refund; let's remove it from the new service."
"Refunds take a long time, coupons are faster."
"The accounting is closed, no cash can be withdrawn."

At this point, the strategy should be:

You choose the refund method: refund to card if paid by card; cash/bank transfer if paid in cash.
Support your claim with documentation: If the service was never received or if there were duplicate charges, unilateral conditions justifying "retention of payment" are open to argument of unfair terms.
Formalize the refund commitment: Clarify it clearly via patient rights unit/email/WhatsApp, stating "refund for this transaction, this amount, by this date."
Parallel line: bank dispute (especially regarding card payments).

Balance: A coupon might sometimes be convenient for the consumer; however, a one-sided imposition , don't lose your bargaining power. The moment you say "I accept the coupon," the nature of the dispute can change.

6) Bank dispute/Chargeback: When, how, and with what documents?

A) Chargeback logic

Chargeback is the process by which a cardholder disputes a payment discrepancy in the goods or services received through their bank. In practice, it operates according to card scheme rules (timelines, document standards, etc.).

Banks and payment institutions often cite timeframes of around 120 days ; however, in practice, these timelines can vary depending on the circumstances and may be extended in some cases

Also, keep in mind: National legislation clearly stipulates that disputes regarding credit card transactions can be made within 10 days (from the due date).
The safest practice is to apply promptly, considering both the bank's internal dispute period and the chargeback schedule.

B) Which arguments are stronger?

Typical strong arguments fall under this heading:

Duplicate charge: The same amount being withdrawn twice by the same business establishment.
Cancellation promised but not carried out: Saying "We refunded it" but not showing up on the card.
Lack of documentation for the service: There is a receipt but no invoice/statement; the service item is vague.
Amount discrepancy: Overcharged amount exceeding the approved amount.

C) Prepare your file to be "chargeback compatible"

Basic package to be provided to the bank/data collection unit:

Bank statement + transaction details screenshot
POS slip (if any)
Invoice and/or service statement (or request letter + record stating that it was not provided if unavailable)
Correspondence with the hospital (return commitment, explanations)
Brief summary of events (date-amount-reason duplicate/incorrect)

Since the card-issuing institution is obligated under Law 5464 to provide a reasoned response to complaints/appeals within 20 days, be sure to carefully record the "application channel and date".

7) Consumer Arbitration Board and consumer lawsuits: When do they come into play?

A) Monetary limit (2026): 186,000 TL

that for the year 2026, applications for consumer disputes with a value below 186,000 TL can be made to the provincial/district consumer arbitration board.

This means that a significant portion of duplicate/erroneous payment cases originating from private hospitals arbitration .

B) Can a bank objection and an application to the arbitration board be made together?

Yes, in most cases, proceeding in parallel is rational:

The bank/chargeback line can provide a quick result.
The arbitration panel produces a document-based and binding decision.

The arbitration panel's assessment is particularly strong in cases involving "no invoice, no breakdown, or vague explanation," because the case the standard of proof .

Note: In consumer disputes, the mandatory mediation regime is assessed based on the type of application and exceptions; a strategy should be developed according to the specific category of the dispute.

8) The most effective “3-stage” solution plan in practice

Step 1 — Written application to the hospital (within 48 hours)

"On this date, for this amount, for this transaction; duplicate/incorrect collection."
“I request that the following documents be provided free of charge” (consumer list, test results, discharge summary, etc.).
"Refund to card/bank transfer within 7 days" is the clear request.

Step 2 — Dispute the charge to the bank (simultaneously)

Objection and document submission within the framework of Law 5464.
Compliance with the form/proof format requested by the bank.

Stage 3 — Arbitration panel / case preparation

The THH hotline is strong for amounts under 186,000 TL.
Consumer case, depending on its nature (and mediation plan if necessary).

9) Copy and paste: Document and return request text (short) to the hospital

Subject: Request for refund and documentation due to duplicate/incorrect charge.

On …/…/2026, … TL was charged to my credit card for a procedure performed at your hospital. Upon reviewing my bank statement/POS record, a duplicate/incorrect charge occurred for the same transaction.

Within the scope of documents that private hospitals are obligated to provide free of charge upon patient request, I request a list of the types and quantities of medications and consumables for which the patient pays, as well as (if any) the results of examinations/tests/imaging and the discharge summary.

the incorrectly charged amount of … TL to my credit card (or transfer it to IBAN: …) within 7 days ; otherwise, I will file a chargeback and pursue consumer complaint procedures with my bank.

10) Frequently Asked Questions

“I have a POS slip but they won’t give me an invoice; can I get a refund?”
Yes. The slip shows that a payment was made; the hospital is expected to produce a document stating “what the payment was for.” The necessary documents have been prepared upon request.

“They’re imposing a coupon instead of a refund; am I obligated to accept it?”
You are not obligated. Depending on the specific case, imposing a coupon unilaterally instead of a refund may give rise to a “unfair condition / restriction of a right of choice” debate in consumer law.

"If I miss the deadline to file a dispute with the bank, will it be completely over?"
Legislation establishes a dispute period starting from the due date; furthermore, there are chargeback schedules in practice. Applying promptly is the safest option.

"Can I go to the arbitration board?"
If the dispute amount is below 186,000 TL for 2026, the consumer arbitration board hotline is suitable for most cases.

11) Conclusion: The “key” to these files is the right evidence + the right order

Duplicate/incorrect charges and POS discrepancies, while seemingly technical, fundamentally two questions :

What is the legal and factual basis for the collection? (Can it be explained with documentation?)
If there is an incorrect/duplicate charge, why is a refund not issued? (Instead of a refund, they impose a coupon, the provision is not closed, or they use internal procedures as an excuse…)

By documenting these two questions , you establish the right strategy between the hospital and the resolution process, the bank chargeback, and consumer claims; and in most cases, you significantly speed up the refund process.

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