Poor service from Game store

I bought 2 cellphones from Game Pavilion, one phone overheated and i took it back to the store, they refused to fix it even though it was still under warranty. I told them that the problem is not the scratch it is the phone that over heated. They took it and send it to their supplier later they phoned and said their supplier agreed to fix the phone. It was with them for more than 21 days and they were suppose to give me a new phone since they've failed to fix it within 21 days. They changed the story and said they will not fix it, the store manager said i am allowed to report them wherever i want but they will not fix it. I phoned Game head office and their complains department but no assisted me. I would never ever recommend someone to buy anything from game store beacuse their service is disgusting and their cellphones are faulty.