Cancelation of contract

It feels like Telkom makes it as difficult as possible to cancel a contract with them. I have a cellphone contract that has expired about 18 months ago and is going on on a month to month basis. I want to cancel this contract now. I went to the Telkom store in Tygervalley to request cancellation, but is just told that they cannot help, push a form in my hand to complete and send to the cancellation department. I did so and faxed it through with all relevant documentation. 5 Weeks later the contract is still not cancelled. When I phoned, they cannot assist, just ask to mail the cancellation letter again. Done that and tried to follow-up. No luck, just have to mail letter again and is informed that I need to wait another 21 days, maybe I am lucky then! No way to escalate it further or get pass the call center who cannot do anything for you.