Worst service provider/customer service

So I'd like to know how Telkom can bill me for the past 5 months for ADSL that I haven't used. In July 2015 I purchased a Samsung smart TV & received 100GIGS of data for free via Vox Telecommunications. I then made numerous calls to Telkom requesting they cancel the ADSL package we have with them. We decided to keep only the telephone line and towards the end of October app**** for an ADSL Package with Vox Telecommunications. I then filled in a Telkom customer cancellation request form, again requesting that they cancel the ADSL package. Thinking this will finally put an end to my woes, as I have been paying the Telkom bill every month since requesting the cancellation with them in July for fear of my credit record would be tarnished. Bearing in mind that I was promised with every call that we would be credited on our next bill,which we were not. After receiving a bill for November and three days later for December as well, I again called the call centre (account queries dept.) & was promised in two occasions that my bill would be credited. It still hasn't been done. We have been using Vox ADSL for the past month and a half, but still Telkom bills me! Frustrated beyond words!!!