INCORRECT DEBIT ORDER DATE

THEY HAVE BEEN CALLING AND TEXTING ME TO MAKE PAYMENT. I LOST MY JOB BUT AGREED TO AN ARRANGEMENT. I CALLLED ON 13TH NOV WAS GIVEN BANKING DETAILS BUT WAS ADVISED AGAINST IT AND TO DO DEBIT ORDER INSTEAD. WE AGREED THEY WOULD DEBIT THE FOLLOWING DAY. TODAY IS THE 17TH. STILL NO DEBIT. I HAVE CALLED. NO ONE IS ABLE TO RECTIFY THE INCORRECT DEBIT ORDER DATE. NO ONE IS ABLE TO CANCEL AND ALLOW ME TO MAKE IMMEDIATE PAYMENT. THE AGENTS TOLD ME SUPERVISOR OR MANAGER WOULD CALL BUT NO ONE HAS CALLED ME