Being charged a decoder thats doesnt work.

Im having a serious problem with Multichoice.<br> I bought a decoder (HD PVR). Now and again it comes with an error (determining footprint\ screen)<br> i have called my times and they couldnt fix it over the phone. I had to brought in the decoder and they gave me a new decoder. That new decoder comes with same error message and i had to take it back again. They gave me a new decoder and now its same error again. I called them beginning of this month so that they can disconnect my services of which they claimed they did. For the shock of my life, today i received a statement with R965.00 balance due. I called and the guy couldnt explain to me where the R900 is coming from and to make matters worse he couldnt pick up my previous calls from their internal systems. <br> <br> I feel like im being ****** my hard earned income for being sold a sub standard product that doesnt work and paying monthly fees for a product that they know is faulty. Im fed with this HD PVR decoder.<br> <br> How can i pay for something that doesnt work or not working ??? I need answers from DSTV before i take this matter up.<br> "