Struggling with Telkom for more than 2 years now

I am struggling for more than 2 years now to get my Telkom account close and my name cleared. Telkom handed me over to Nudebtmanagement and after more than 3 weeks they come back to me and tell me my account is closed but I still need to pay the account for services that I didn't use for more than two years. I think this is totally unacceptable. Telkom don't do their work and we as customers have to pay for their incompetence. I don't know what to do anymore.