Telkom account

I am billed for a ADSL line that was never installed. I contacted Telkom on 1 Oct and was promised that everything was cancelled. Twice after that I went into a Telkom shop where they again told me the problem was solved. I don't know where they got my account nr from but an amount of R669.28 was deducted from my account on the 30,September. That was the first time I wandered what this was for. They promised me that this amount will be put back into my account and that the Telkom account has been cancelled. I phoned again today to find out when this money will be paid back to me, and with a shock the lady told me that this account is still running and that on the 11 November money will be deducted again. I want to know At which flat this ADSL line was installed, when, and who signed for this. I NEVER GOT A ADSL LINE !!!! My account nr is***. How can I talk to somebody who can give me some answers?