Building society Nationwide has admitted an error which meant 704,426 of its account holders had money taken from their accounts twice.
The Swindon-based finance group said a “one-off human error” had led to the double payments.
Payments made on Tuesday were processed again yesterday in error, it confirmed Accounts would now be corrected overnight.
Nationwide, the UK’s biggest building society, has 4m customers.
Nationwide divisional director for customer experience Jenny Groves said: “A small number of customers will have been adversely impacted [through declined transactions], estimated to be less than 50,000.
“All charges will be refunded in full and any costs associated with this error will be reimbursed in full. None of our customers will suffer financial loss as a result of this one-off error.
“We apologise once again for any inconvenience or uncertainty caused by this error.”
It has not revealed the nature of the ‘human error’ that was to blame, but explained that the error came to light earlier on Thursday.
