FAILURE TO CANCEL MY CONTRACT

I have immigrated overseas, for months I have called MTN from overseas and emailed over and over again without any success in cancelling my contract. They keep deducting money every month from my South African account despite all my requests to cancel immediately and the fact that no calls or data have been used for over 4 months. It's disgraceful that you will continue to take money even though all the answers to your retentions department have been answered. I am not even locked into the contract, the phone was paid off years ago and it is just a roll over for data and minutes.