How the *** do you cancel a phone line with Telkom

I have been trying since the 2nd of February to cancel a phone line at my office. All the required documents were submitted 3 times already. I receive a automated response from their website stating that the request has been received and logged. Till now the line is still active and I still get billed every month. Even phoning their cancellation department 5 times already has no effect. Everybody just says there is nothing on the system and I have to re-submit the cancellation request. Three weeks ago one of the people on the cancellation line said he logged the request and somebody will phone me back for confirmation. Still nothing and I have to pay again.