Unknown Card Transaction: What to Record Before You Dispute It

Contain an unfamiliar card payment, identify the statement descriptor and preserve a useful evidence trail for the card issuer.

An unfamiliar card entry may be fraud, a recurring subscription, a delayed posting or a merchant name that differs from the shop’s public name. Do not ignore it while trying to identify it, but do not accuse an unrelated business based only on an abbreviated descriptor.

Lock the affected card or the relevant online/card channel through the issuer’s official control where available. Then preserve the entry exactly as displayed so the issuer can trace it.

Record the transaction before changing anything

• Amount and currency.
• Date, time and whether the entry is pending or posted.
• Complete merchant or ATM descriptor shown by the bank.
• Last four digits of the affected card.
• Any transaction or retrieval reference displayed.
• The time the card was locked and the complaint reference.

Do not publish this information. Keep it in a private case note and redact unrelated balances when sharing evidence.

Check ordinary explanations quickly

Review known subscriptions, recent travel, digital-wallet card use and authorised household transactions without disclosing credentials. Search receipts for the same amount and date. A temporary authorisation can also change or disappear, but only the issuer can explain the account-specific status.

Report the exact entry to the issuer

Use the phone number printed on the card only if the card is still securely in your possession and the number is legible, or obtain contact information from the official bank website or app. Ask whether the card must be permanently blocked and replaced, and request the issuer’s dispute procedure.

Keep containment separate from reimbursement

Locking a card reduces further use; it does not automatically decide whether an existing transaction will be refunded. The dispute process may require a form, additional evidence or time for the transaction to reach final status. Keep using the same complaint reference.

Warning signs requiring urgent action

• Several small test transactions appear close together.
• A foreign or online entry appears when the card was not used there.
• OTP or card-verification messages arrive without your action.
• The phone or SIM connected to the account also loses service unexpectedly.

Protect the SIM, email and banking credentials as separate channels if more than the card may be exposed.

Pending and posted entries need different questions

A pending authorisation may still change before final settlement, while a posted entry has reached the account record as a completed debit. Ask the issuer what the displayed status means and whether a dispute can begin immediately. Do not repeat a purchase merely to test the card.

Merchant descriptors can contain a parent company, payment processor or abbreviated location. Search personal receipts and subscription records, but contact the card issuer through an official route when the entry remains unknown. Do not call a number supplied in the suspicious transaction message.

Escalation and sources

The CBN complaint guide explains how to complain to the institution first and what evidence an escalation should contain. Verify CBN contact information on its official contact page. Reviewed 5 August 2026.

Nigeria USSD Codes Editorial Team

Publication editorial team

Nigeria USSD Codes

The Nigeria USSD Codes Editorial Team researches, reviews and maintains practical guides using official provider and regulator sources where available. Corrections are checked before publication, and sensitive actions are directed back to the responsible provider.