Telkom Mobile Contract Cancellation

I've been trying to cancel my telkom mobile contract after a two year contract period, for four months now. First i had to fill in the online form on the Telkom site. After that i found out my service has not been cancelled. After calling in for a couple of times the last operator told me the online form is not working and i must do the cancellation directly with her. After that i found out that my contract is still running and the debit order is still running. What else do i have to do?? I want to cancel this contract because it is past its contract time and i have tried to cancel.