Refuse to cancel my Contract

I have sent my first request for service cancellation on the 17th of July to ********** 1 Month later, I still got no response from Telkom and still receive invoices from them. Then, on the 16th of August I am asked to send the form to ********** and guess what, its 1 month later now and still I have not heard from Telkom. Now they asked me to send it again to ********** I have moved to Canada and cannot keep on phoning to beg you to cancel my contract. I am following your processes to do the cancellation and yet still you do not process it. What else must I do?????