Impossible to cancel ADSL account

I have been trying to cancel my Telkom ADSL for months now, but it seems impossible. I phoned Telkom numerous times, each time being put through to the "cancellation department", only to find out there is no such department, you have to speak to a random person like I eventually got to in "new services". I've sent the forms to that email address more than once, and still awaiting a response, while still being charged every month. In speaking to around 10 people at Telkom, no one can simply cancel my account. I would never recommend Telkom services to anyone.