Frustrated customer

My dad Shadrack bought a Hisense TV 49" smart TV at Best electric Vereeniging. We had a break in December and the TV was ****** but we had an insurance with the shop..so the insurance approved our claim but now we haven't received the TV in more than a week, the shop say the don't have the one we bought but they have the same TV but it's 50", so the manager approved to give us the Hisense smart TV 50" and my dad already signed the contract for the 50". When we went to fetch the TV we were told that their boss refused saying the 50"is just a little expensive with few hundreds, but now he wants to give us Sinotech(not smart TV) and is way lesser in price than the TV we bought,.."imagine!"...,this is not the first incident, the first time we bought an LG microwave it got broken they took it to fix then they said will give us a Kelvinator microwave less value as the one we bought, which is already broken. It seems like the customers are not cared for as long as they make money and cheat us coz that's how we feel.