Trying to cancel

Telkom is on my very last nerve and I have no idea how to handle this any further. Our ADSL line was ****** in August and Telkom advised that no new line will be installed. So we cancelled our Telkom line, since the and after numerous calls trying to cancel & being promised it has been cancelled, we just keep getting bills and statements from them. Can anyone please help to get them cancelled. I want absolutely nothing to do with this ********** company and want anything still in our name removed and cancelled.