DStv incompetence

I had a DStv package installed in August this year.. the initial one I had was a price lock after the installation it was discovered the decoder I was using was linked to another account,I then proceeded to CANCEL that decoder and subscription and then opted for a normal Compact subscription of R399.. 3 months went by and not a single call email nothing from them then they decided to bill me for that very same cancelled subscription thus in turn suspending my ongoing subscription which uses an entirely different decoder and subscription and this AFTER IT'S BEEN PAID!!! .. SO now in 2 weeks they have suspended my service 3 times .. In a Facebook chat the call log of the cancelation was sent and yet they still suspend my servive,this has gotten to a point where it's literally causing problems in my household . I am now going to take this matter on a legal direction because I am sick and tired of the same thing happening over an river and there is no communication on their behalf .DStv is literally the worst service provider I've ever encountered and this time I am going to make sure I take it to the extreme