still debiting for a cancelled contract

This is the second time I am bringing a complaint about MTN regarding my contract that they are still debiting me for regardless of the fact that it was cancelled in January 2015. I have the cancellation letter as proof and would like to be assisted in this matter urgently. call centres do not help. I received this reply from MTN:<br> <br> Hello S.Kriel,<br> <br> We are truly sorry for any inconvenience caused and for the breakdown in service experienced.<br> <br> Kindly can you send the signed cancellation request to [Email Removed] confirming that you requested the cancellation in January 2015.<br> <br> The store needs to confirm to whom and on what date the cancellation request was submitted in order for the line to be cancelled and the account to be credited accordingly.<br> <br> Once again we do apologize for the inconvenience caused.<br> <br> Regards<br> Tim<br> MTN Complaints Management Team: REQ:***