Authorisation for direct payment (debit order)

On 18 Dec.'15, I faxed the Authorisation to deduct monthly payments for accounts. 9*** and 9***. <br> <br> It is now 27 Feb.'16, (two months) and have received statements saying that accounts are overdue, and Interest is being charged.<br> <br> Someone in the relevant department is not doing his/her job. I have copies of the faxes being sent to the department as 'successful'. Why has my request not been processed? When I try to phone, no-one answers the phone.<br> <br> HELP