Co-operative Bank plc (LSE:CPBB) has apologised to its customers for a glitch in its systems which led to some payments going through twice for small business accounts.
"Almost £5k down thanks to this with no resolution in sight," one person took to Twitter/X to say.
Apologising for the mistake, the Co-op co Bank said only a "small number" of its 96,000 small business customers experienced the glitch.
A spokesperson said: "We are aware there are a small number of SME account holders who have duplicated payments showing in their balances and are in the process of correcting this issue.
"We apologise for any inconvenience caused and are supporting customers during this period."
Last month, Coventry BS and The Co-operative Bank plc (LSE:CPBB) agreed terms of a merger despite the society's members not getting a vote on the deal.
Coventry will buy Co-op Bank for £780 million under the agreement, creating an entity with an £89 billion balance sheet.