The Co-operative Bank has apologised after customers said a glitch had taken payments twice from some small business account holders.
Customers took to social media to complain, with some asking whether the bank had been hacked and one claiming he was "£5k down".
One person on X, formerly Twitter, complained that they are "almost £5k down thanks to this with no resolution in sight".
It is unclear how many accounts were affected by the glitch.
The bank apologised to users on X, who posted about the issue.
Under one user’s post, it replied: "Our business team are aware of duplicate, historical transactions showing and they’re working to resolve this as quickly as possible.
It is unclear how many accounts were affected by the glitch
GETTY IMAGES"I’m sorry for the inconvenience and concern this has caused."
Co-op Bank said it was aware of a small number of business account holders affected and was working to correct the issue.
The lender said that "duplicate, historical transactions" had been appearing in some business customers' balances.
Customers have reacted with alarm over the missing money, with some claiming they had been pushed into their overdrafts.
One tweeted: "Utter shambles regarding duplicate historical transactions being taken from customer accounts without any notification from you this has happened.
"Thousands of £ out peoples' accounts without even notifying customers. Tell us how this will be resolved?" (sic)
Someone else said: "I checked my balance after not being able to buy some petrol to notice that I’m now massively overdrawn and have double transactions going out from weeks ago."
Co-op Bank’s website says it has about 96,000 small business customers and 3.1 million retail customers.
In a statement, Co-op Bank 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."
There are currently around five million customers signed up to the Co-op membershipCO-OPLast month, Co-op Bank agreed to be bought by Coventry Building Society for £780million.
The deal will create a high street lender with assets of £89billion. It will also see the private equity-owned Co-op Bank return to mutual ownership.
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