Impossible to cancel contract

I have now sent numerous emails, with all the required documentation, to cancel my contract with Telkom. I keep getting a automated response back but for 8 weeks now, no feedback from any person within Telkom, yet my bills keep getting sent and money exiting my bank for a property I no longer live in. ON the phone, I am simply told cancellations can only be done by email. Telkom were great when I established the new line but now are letting me, and many other customers down, by having no clear cancellation mechanism that can be held to account.