Over billing and line cut every month

I'm very disappointed with the service from Telkom SA. I have been billed for an extra phone every month of which I don't have and never bought. My line is being cut every month. I have called the call centre, went to the Telkom branch in Alberton City and I'm being told its cancelled and my money debited will be reversed into my account but with no success. This month I have being billed R15000.00 and I'm only paying contract for 3 phones. Its annoying and disturbing. I just wish I never took the contract as I have to call and visit the Telkom branch every month. It's time consuming and messing with my business. I would like people know the incompetence of Telkom service and staff.