No response to cancellation of Telkom account

I sent the relevant documentation to ********** on the 30th of September 2017, received a response saying Telkom had received my request to cancel my landline and ADSL. I was then told that they cannot reach me telephonically to confirm the cancellation request and so my service remains active - despite me calling the call centre twice to try and resolve the issue. If I receive a bill for services dated after the 31th of October 2017 I will not be paying it.