Nationwide Building Society has been forced to apologise to thousands of customers after a technical glitch led to accounts not being debited when cash was withdrawn from some ATMs in Northern Ireland.
Press reports say the problem affects more than 7500 customers who withdrew around £400,000 from Northern Bank cash machines between November and February.
The problem is thought to have stemmed from an IT fault in the bank's connection to the Link network.
Jay Colville, area director of Nationwide in Northern Ireland, told BBC reporters that in December Link upgraded the ATM system, but the Nationwide system didn't "pick that up correctly".
Nationwide has written to affected customers apologising for the error and will debit the money from the accounts on 10 March. Colville says the Nationwide will be "sympathetic to hardship cases" and "won't charge people for this event".