Co-operative Bank customers have reacted angrily after a glitch meant payments were taken twice from some small business accounts. Customers took to social media to complain, with some asking whether the bank had been hacked and one claiming he was “£5k down”. The BBC Business news service is reporting that the Co-op Bank has said it was aware of a small number of business account holders affected and was working to correct the issue. “We apologise for any inconvenience caused and are supporting customers during this period.” According to its website, Co-op bank has about 3.1 million retail customers and 96,000 small business customers. The lender said that “duplicate, historical…