Paying for a service not being used

A few months back I app**** for extra view. Bought a new decoder and used the old one for second view. After the installers were there this did not work so we took the pvr decoder to DSTV in promenade to "marry" the two devices and they called it. Since they did this my decoder keep saying hard drive faulty. I have complained, and waisted my airtime on several calls. I even went back there (DSTV promenade) and they just keep denying they broke the pvr and wants us to pay for a new decoder!! With this i am unable to enjoy the extra view as its still no working. This is pathetic that a big company would admit they were wrong and just fix what they broke. On top of that I am paying for extra view but not using this service because of a decoder that worked perfectly but now is broken!!!!