Telkom's bad service

I had a 2 year contract with Telkom. At a set price per month. In the entire 2 year period my set amount as per contract was always higher. Was only supposed to pay R599 for a 4speed uncapped data package. I cancelled my telkom service in October 2019. They still bill me now at R1700 later. Now they hand me over to P&P Attorneys. Try to call them but they just as pathetic as Telkom's service. I have called Compuscan to resolve the issue regarding Telkom as they now list me as 3 months arrears???? People steer clear away from Telkom....