Poor service

This company is busy billing my account for the services that was not render....a month ago I've ordered a pricelock decor then later decided to cancel it since I was told it could only be delivered after 2 weeks...I then decided to buy myself an explora and got myself an installer I then called in and asked the consultant from multichoice to activate the new decor for and to cancel the other deal that I took with them and he advised to call a different department for cancellation and I did as I was told spoken to the cancellation department and everything was cancelled according to them....2 weeks later I was called by the courier company and the guy said he came to deliver the decoders I told the guy I've cancelled the deal therefore I wont be accepting the delivery....i then tried calling multichoice so many times to cancel the deal from their side and still nothing they keep on saying it was cancelled but they keep on debiting my account to my surprise I'm now R1300 and something what for I really dont know...I'm tired of their poor services.i want nothing to do with them they should rectify their mistakes and stop billing my account....otherwise I'm taking this matter up with my lawyer I wont have my name listed for nothing.