Please help

I am being billed for an internet service for a line I had cancelled two years ago with Telkom.I have tried contacting them and have now given up on trying to resolve the matter.The line has been cancelled however they continue billing for internet service that was cancelled at the same time.They now demanding R1667 from me. Please reverse and close account as requested 2 years ago Emails have been sent to *** with no response Dispute reference number ***5 with nothing done to date Acc No *** TIN ***