Impossible to cancel your billing when Telkom have your information

I signed up for data on a land line on a monthly invoicing basis. Very easy you do it over the phone in a couple of minutes. Lines were always down and could not use my data. To cancel this service is unbelievable. They have made it near impossible to cancel. I have not been able to use their data since November 2017 and have cancelled more than once. I am still receiving bills now for March 2018. Despite sending through copies of ID etc to the cancellation department and speaking to numerous agents on the phone. I want my Telkom line cancelled and I want to stop being charged for the service I do not use. "Yes sir just keep paying and then you can raise an objection". I guess if this does not work I will have to drive to Telkom and spend the day there with proof of residence ID books etc etc funny how they are quick to sign you up with zero info but its such a mission to cancel. Not something that Telkom should be proud of!