Cancellation of Contract

My contract has come to an end, and I called the 808 number on 13 Sep using my contract phone, to have the contract cancelled. I was on the line for about 20 min with no answer, and I decided to call using my other pre-paid phone and the call was answered within 2 minutes (when calling using the contract number they already know what you are calling for as you have to select relevant options). I then requested that my contract was cancelled, and the lady said she'll send a request for cancellation and that I'll receive an SMS. To this day I have not received the SMS so I do not know if my contract has been cancelled. My debit order was normally on the 25th, and I REALLY HOPE THIS POOR SERVICE IS NOT GOING TO LEAD TO A DEBIT ORDER. I REALLY HOPE THIS WONT HAPPEN BECAUSE. Clearly MTN does not want to provide the service to cancel my contract.