I once had a small overseas charge hit my account while I was travelling and I remember the sickening pause you feel when you see an unfamiliar merchant name. I called my bank, started the process to dispute it — and learned quickly that getting a reversal isn’t automatic. Over the years I’ve helped friends and readers navigate unauthorised international transactions. Here’s a practical, first-person guide to what actually works and the evidence banks take seriously.
First move: act fast and document everything
When I spot an unauthorised overseas transaction, the first thing I do is freeze the card (or the account) if possible and note the transaction details. Speed matters: many banks and card networks operate on set timeframes for reporting unauthorised transactions — often 60 to 120 days, sometimes less for wire transfers. So the sooner you contact your bank, the better your chances.
Here’s what I collect immediately:
Call your bank and open a formal dispute
I always call the bank first to alert them and request that they open a dispute. Ask to be transferred to the fraud or disputes team — they handle unauthorised overseas charges. Be prepared to provide the details you recorded. Ask the representative for the following:
Getting the reference number matters. I log the name of the person I spoke with and the time — it helps if follow-ups are needed.
What types of evidence actually convince banks?
Banks need to determine whether a transaction was authorised by you or was fraudulent. Over time I’ve seen that a combination of these documents is most persuasive:
| Type of evidence | Why it helps | How to get it |
|---|---|---|
| Bank/app screenshots | Shows the transaction and exact timestamp directly from your account | Take high-resolution screenshots immediately; include account mask and transaction ID |
| Travel tickets/boarding passes | Proves your location at the time if you were not in the merchant’s country | Save boarding passes, train tickets, or hotel receipts |
| IP/location logs | Shows where a login or charge originated (useful for card-not-present fraud) | Ask your bank or the merchant for IP logs; some apps show recent login locations |
| Merchant communication | Can confirm you never authorised the charge or that the merchant misposted a sale | Email the merchant and request proof of authorisation/copy of receipt |
| Police report | Used in more serious or large-value fraud cases; formal record helps the bank escalate | File a report with local police or cybercrime unit; include bank reference |
| Receipts and statements | Confirms you weren’t the purchaser or that amounts differ | Upload PDFs or scans of relevant receipts |
Card-present vs card-not-present: different proof needed
I’ve noticed banks treat these two scenarios differently. If your physical card was used abroad (card-present), banks often look for ...
For card-not-present fraud (online purchases), banks expect stronger digital trails: IP addresses, device fingerprints, or proof that the merchant sent an email confirmation to a different email than yours. If you can show you never accessed that site or the email confirmation went to an address you don’t recognise, that’s powerful.
How to request evidence from a merchant
Don’t be shy about asking the merchant for details. I write short, clear emails that include the transaction date, amount and my bank case number, and I ask for:
Many legitimate merchants will share a receipt or cancel a mistaken charge. For some international merchants, responses can be slow — keep chasing and forward everything to your bank.
Chargebacks, network rules and timelines
When a bank can’t resolve the dispute immediately, they commonly initiate a chargeback via the card network (Visa, Mastercard, Amex). Here’s what I tell people about timelines:
Keep in mind that if the merchant provides proof of a valid transaction — signed receipt, delivery confirmation — the bank may side with them. That’s why collecting counter-evidence early is crucial.
When you need to escalate
If the bank rejects your claim and you’re convinced it’s wrong, escalate. I’ve found these steps effective:
The financial ombudsman can force a bank to reverse a decision if they find the bank didn’t follow its rules. Include your bank’s reference number, dates, and copies of all communications when you complain.
Preventive steps that save time later
I treat prevention as a daily habit. A few small changes reduce the chance of unauthorised overseas charges and make disputes easier:
Sample message templates you can copy
When I contact merchants or my bank, I keep messages concise. Here are two templates I’ve used and edited for friends:
To bank fraud team:
“Reference: [Your case number]. I am disputing a transaction on [date] for [amount] with merchant [merchant name]. I did not authorise this transaction. Attached are screenshots of my statement, my travel records showing I was in [location], and correspondence with the merchant. Please confirm receipt and advise the next steps and timeline.”
To merchant:
“I am contacting you about a charge on [date] for [amount] under the name [merchant name]. I did not authorise this purchase. Please send a copy of the receipt, the IP address and device information used for the order, and delivery proof. My bank has opened case number [bank case number].”
I’ve learned that being calm, organised and persistent gets results. Banks handle lots of cases; standing out with clear documentation and timelines helps your claim move faster. If you’d like, I can draft a customised message for your situation — tell me the details and I’ll tailor it to the merchant or bank you’re dealing with.
