It is a used car. Sometimes small dealers are better as they are eager to grow so will go that extra mile. Sometimes the big dealers are good but their tag justifies it. One never knows. I mean he got the issue months after he had the car... personally I would not bother and get it fixed. Things break. It is just metal that helps you go from a to b. People have unreasonable expectations and the worst part is, they think it is their right. To me it is same as the 'right to claim benefit'. Take some responsibility ffs.
In some countries you get zero warranty even on new cars. The saying goes, there is no gurantee for human life and this is a machine bound to break. Just mentioning the other extreme.
The OP is not even interested so I do not see any point in discussing this.