Telkom - Nightmare trying to cancel

I cancelled my Telkom contracts in a Telkom Branch in June 2017. In about August Telkom had still not cancelled and reissued the accounts under new service numbers, and billing continued. When trying to cancel Telkom said I had sent the wrong service numbers (ie they had issue new service numbers) for cancellation and therefore it was not a valid cancellation. I went back to the branch, followed by many hours and many calls to the call center and submissions to their cancellation emails , billing just continues. Nine months later they are still billing me, no refund, I continue to try with the branch contact and cal center contacts, and billing continues. NEVER sign a contract with these guys they are unplayable!!!