Bad internet, bad service

I took a router about 11 months ago. For the past two and a half month my internet started buffering. I have sent emails, live chats, called DSTV and also walked in to the store. I was tols at the store that there is nothing wrong with the router as it's connecting perfectly there. I told them but I'm experiencing problems where I'm staying its buffering sometimes it will say not connected. I even have screen shots as proof. I was told that I will need to cancel and pay the remaining months of the router. I told them I can't be paying for a router yet I never wanted to cancel, I just want a proper working internet of which it's not working anymore. I am so disappointed with DSTV, my time of calling and going to the store yet no assistance but only that I need to pay as if the fault is on my side! I do not recommend them at all!!