Telkom USELESS!!! Charging for line/adsl rental since June

After cancelling my ADSL/Line rental with Telkom in June 2017. I am still being vcharges every month. I am being told that I need to specify which service I want cancelled. I did the ADSL cancellation in June but not the line rental (which no one advised me to). I mean it is as if I do this on a daily basis. In September a lady by the name of Lerato assured me that if I pay the outstanding amount, they will put the paper work through for the line rental to be cancelled as this is the only service currently running. Guess what, this month DEC I received another invoice for R700. When I phone the lady at the billing department she told me that I have to cancel my ADSL (this was confirmed that is was cancelled about 3 months ago). I have all the proof with me but no one is assisting.