What do you do when you received a cheque that was not signed in accordance with the mandate and the bank ask you to pay the money?

If I receive a cheque that is not signed according to the mandate, I would first verify the details with the issuer to confirm the error. I would then inform the bank of the discrepancy, providing any necessary documentation to support my case. It's crucial to follow the bank's procedures for handling such issues, which may involve refusing the cheque or seeking a corrected one. Always ensure to keep a record of all communications for future reference.