By Caitlin Powell in Melbourne

Commonwealth Bank has apologised after some customer  payments were unexpectedly repeated, allegedly leaving some accounts overdrawn.

On Saturday the bank posted on social media that “some customers are seeing duplicate transactions from payments”.

“We are working to reverse these transactions as a matter of urgency and any fees charged will be refunded,” the statement said.

“We’re sorry for the inconvenience. Thanks for being patient with us.”

AAP has requested further comment and an indication of how many people have been affected.

The bank’s post prompted complaints from customers.

Some shared their concern that their accounts were overdrawn.

The latest incident came after the bank, on Thursday,  apologised and agreed to pay $7.5 million after sending 170 million emails that breached Australian anti-spam laws.

The marketing messages sent to CBA customers between November 2022 and April 2024 breached the Spam Act 2003 because they did not include a way to unsubscribe, the Australian Communications and Media Authority said.

A total of 34 million messages were sent to people who had either not consented or who had withdrawn their consent to receive such messages, the authority said.