Non compliance

I have notified telkom of my cancellation of my landline, but they refuse to do so, sending me back and forth whilst they know the adsl circuit has been moved from the isp to telkom and cancelled by the isp but they want proof and yet it shows on their portal from the isp that is has been cancelled... then above that they dont want to cancel over the phone one must do it on their website which i have done but they marked it as done and not possible because the isp has not cancelled but when trying to redo the request one cannot redo the request as the system does not allow another request to be placed again, they do not want to complete the tasks so i will have to take it to the onbudsman