DSTV as usual terrible service

I agreed to a 24 month explorer decoder package for R89 per month. It included delivery a new decoder and installation. The intaller could not get sound on the HDMI cable and said the decoder is faulty and that i must go to a centre for them to check it. I waited outside Randburg centre for 30 mins to have my temperature taken, a rude lady did not say a word but merely pointed where I must sit and what to do. I had to back in the que to get into the centre. Another staff member aksed for the same details again and told me they would not exchange the decoder for a new one but would swap it for another one (ie second hand). As I was within 7 days i wished to cancel it and I did not want to pay for a new one and yet get a 2nd hand one. I called the customer care and was told I was number 50 in the que. I went on the chatline and was told i could not cancel due to the price lock. So even though DSTV have delivered a faulty decoder i have to either i) accept a faulty decoder for 24 months, ii) accept a 2nd hand decoder when I am paying for a new one and stay in a que for over an hour to get the 2nd hand one. iii) cannot cancel within 5 days of receiving a faulty decoder?