Billing after contract expired

I have been billed for 2 months now after cancelling the contract for Telkom Mobile.<br> I call the call centre and get reference numbers that someone will call be back within 72 Hours but no one calls me back. No one can explain at the call centre why i am not receiving the call back.<br> <br> This is getting out of hand, therefore i will need to cancel all the contracts i have with Telkom Mobile.