Good engine worst vehicle

Interior (Features, Space & Comfort) I got repeated power window problems right from purchase of new vehicle. Heater plug is bothering me. I got it changed just 5 months back at concord showroom, hyderabad but again has same problem. Engine is sounding more in the 3rd year itself. I cant open 1 door from inside from 3rd year. When I ask about power windows they say that "you used them roughly". I cant understand one thing. I am a doctor. I am using AC even in winter in the car. I use power windows rarely. How can they get damaged. These idiots dont accept the poor quality they maintain.  Seats sounds like kir kir in the worst roads. When I complain about this to tata toll free number they does not give the feed back and they support service centres and not the customer. The important thing to notice is that they doesn't take complaint on tata. Then how can they improve the service to customers. O o god, why I have taken this vehicle.

Fiat engine. nice pickupVery hard clutch. power window & heater plug problems