Telkom refuses to cancel already expired contract

I had taken a data contract out with 8ta several years ago. The contract has expired years ago. In January this year I cancelled the contract. Filled out the form and mailed to through to ********** as instrusted by a telkom employee. It is now 5 months later and the contract has not been cancelled. I email telkom every month and still nothing. The reason why I cancelled the contract was because I left the country. Now i am sitting in New Zealand and every month Telkom takes my money for a service i no longer use. I am extremely upset!