Paying for a service I NEVER TOOK OUT!

So I could not understand why my line gets suspended every month and why the amount outstanding never goes off. I transfered my 2meg uncapped adsl line from Illovo to Sunninghill and I just found out that Telkom has been billing me for a weekender line that I never took out and agreed to pay for and now it is my responsibility to cancel this service that I NEVER took out!!! Going from R580 per month to R800 and something thanks to Telkom! Now I have to phone in - I have to dispute - I have to pay for something that I NEVER agreed to pay extra for!!!!! Now my line is suspended and I have no internet due to Telkom. In addition to this I changed my billing address and they still had my old email on!!! But the best is that the agent asks me to confirm my billing address as [Email Removed] on the line and then when I ask them to email me the invoices she says that she doesn't have that email but my old one? So how she probably didn't listen when verifying my details so anyone can probably call in...When I say that they should cancel it as I never agreed to this additional service then she says if I don't do it they will just keep on billing me. What great service!!!