Bad service and empty promises on extended warranties

I bought a microwave from game with an extended warranty. I notice in December that I had a rust on th edge of the frame inside. Then on further notice we saw that the door was swollen. We don't know how that happend but the rust obviously came from the door swollen and steam was escaping from the door causing the rust. My husband took it back and they said it will take long in December to sent it away as every supplier is closing over the December holidays. We then took it back today and obviously the rust got bigger. We leave the door open after using it. The food did heat or milk didn't boil. So we took it back and they said they will not fixed it. They dont fix rust. But it wouldn't rust if the door didn't closed properly. We paid 6000. For it. We are pensioners and my husband is disabled he then just left the microwave there because he couldn't load it again. I think they should have replace the door obviously the problem all came from there. When they sold as the expended warranty they told as they will replaced it if it went faulty. I had a microwave since the 1985 and never had one break on me. The only reason why we bought this one is becausemy square plates didn't fit in the 30l microwave. They treated us like dirt I will never buy from Game and take their extended warranty. I am a sassa pension and my Husband only received R9000 a month. So we have no money to buy a new or even a small one. We have no stove aswell.