Telkom is the pits

I have been receiving calls from collectors to say I owe Telkom. I have never had a contract with Telkom. I found out that I have been listed and on a *DEFAULT* status. I love you have advised on many occasions that I don't have any contract or credit with Telkom. this has been a nightmare for months. I don't even know where to start clearing this d** thing.... Cause I'm sure as hell that I won't be paying for something I know nothing about.