Contract cancelation - A NIGHTMARE with Telkom

It is taking me more than a year to cancel a contract that expired for which I'm still being billed for.

I got retrenched and paid till the time came to cancel the contract. The amount accumulated to date is more than R4000-00 despite trying to cancel on the website, via email, and numerous calls to and from Telkom where the line gets cut off every time when I'm placed on hold even when I go into a branch Im told they don't deal with cancellations, I must phone. IM GETTING NOWHERE!!!

So, Telkom, I am out of ideas as to how to get this canceled and the accumulative amount (not my fault but Telkom) be deducted in order for me te get the account settled.??