service centre people spoiled my laptop and now they are saying that laptop comes with that problem inbuilt.

I gave my my laptop in therir service centre for repair and they fitted that laptop’s body loose but that i time i did’nt check this thing on next day i lock the complaint and gave my laptop to service centre on 11th june. they on 12 july they say that laptop comes like that loose fitting and this is not a problem. when i called on their tool free number they also trying to manipulate me. The biggest problem is that laptop is out of warranty on 30th june. Nobody is listening to me. please do needful as soon as possible