Unpaid fee due to debit order going off before requested date.

I am very upset that Metropolitan debited my account 3 days before which has resulted in the debit order being reversed and i am sitting with an unpaid fee. and this now reflects on my bank statement. this is really unacceptable. Metropolitan response to this is we cannot assist with the unpaid fee. It is their fault to debit my account and now they cannot do anything. This is very upsetting especially since i mentioned my pay date is on a certain day and not before,