Inefficient Telkom.

Four and a half years ago I moved to my current address and had a land line installed - pre-paid. Last year October I received a call requesting that I convert to a non pre-paid line which I agreed to. I have not received an account or had my bank debited. Yesterday I finally got hold of accounts to be told that my address was that of the old one, as well as the phone number. How on earth can Telkom not know I have moved when they not only came to fix the line but also paid into my bank account for damages caused by them to my driveway? This is gross inefficiency on Telkom's part. I paid more that the amount owing to clear the balance and they recorded my new address that they didn't know about even though they installed the phone here? Now I want to take out a Wi-Fi contract only to be told that there is something wrong with my account and they ignore the proof of payment where I am in credit.. Telkom I will now consider cancelling not only the land line but also the application for the Wi-Fi and go to a supplier that knows what hey are doing. Very irritated.