Still no feedback after a Hello Peter Report

I posted a previous report last week explaining my situation. In summary my debit order did not go off in August. I paid the money immediately. After more than a month, over three telephone conversations, an unpleasant experience at the Centurion Mall branch and MTN responding to my Hellopeter query asking me for the Proof of payment AGAIN, nothing has happened. They have debited over R900.00 this month. After i have faxed the proof of payment upon request LAST WEEK, no has contacted me or given me feedback in any way. I am cancelling my contract.