ANNOYED BY MTN

AFTER NUMEROUS CALLS TO MTN RETENTION TO CANCEL MY CONTRACT DUE TO FINANCIAL CONSTRAINTS MTN STILL CONTINUES TO BILL ME AND HAS FAILED TO CANCEL MY CONTRACT IM NOW DESPERATELY ASKING FOR HELP FROM HELLOPETER.WHAT ON EARTH DO I HAVE TO DO FOR MY CONTRACT TO BE CANCELLED. I DONT REALLY UNDERSTAND WHAT I'M PAYING FOR BECAUSE MY CONTRACT ENDED ON THE 3RD OF JULY.SHOULD I GO TO THE BANK TO STOP THEIR DEBIT ORDER MAYBE I WILL GET THEIR ATTENTION