Faulty products

I bought a lawnmower last year in October on special. I mowed my lawn two days after I bought my new Ryobi lawnmower from Game in Somerset West. It went on.for two minutes and it switched off and wouldn't start again. I took.It back to Game, they replaced it with a new one , a different make. The new one also gave problems. It started leaking oil, we only mowed twice with it. We took.It back to Game , I insisted on a new one and the Manager , a lady Said I can't have a new one. I said I don't want a lawnmower that's fixed, because I have experience if lawnmowers being fixed in the past, by the very Game. It's never the same again. It breaks and eventually a few years back I had to buy a new one again. The manager wasn't helpful at all. She didn't really care about customer satisfaction. They repaired it. I cut my grass in the week for the first time since I got my lawnmower back from them , and to my horror it wasn't fixed properly, like I warned her it would happen, after five minutes if cutting , I could smell petrol again. I'm tired if going to fight with the Manager. I insist I get a brand new lawnmower. I don't want a fixed one. It always breaks. Game must keep to their policy of customer satisfaction and not sell inferior products. I'm not taking the lawnmower into Game until I hear from them via Help Peter, because I know I'm just going to go and fight with the manager. She knows nothing about customer satisfaction.