Failure to accept contract cancellation

My Contract ends 31 October, on 1 October, 31 days before expiry as per MTN's contract stipulations, I e-mailed them a formal letter with all the required details requesting the cancellation of the contract. I received a reply within 48 hours asking what they could do to keep my business. I explained that I no longer live in SA and therefore have no use for the contract. Since then I have sent several follow-up e-mails, but MTN has failed / refused to acknowledge my cancellation request. I know from past experience if the cancellation is not logged they automatically renew the contract and continue billing the customer.<br> <br> All I'm asking is a reasonable response to a reasonable request, as prescribed by the contract. If MTN fails to respond and the account is automatically renewed I will take legal action, which is a loss for all parties involved.