Pthetic performance of AC with Grande Punto

A Bought The fiat Grande Punto with High hopes. But once I had this cars, problems with it were never ending. Firtsly, the plastic parts used in Punto for exteriors gets fade out very soon. secondly you cannot use this car in delhi summers as AC will only work for the name with no effect on burning hot climate. Every complaint receives same response from dealer that this problem is there in all Punto. I suggest that the company should take back these cars and try something new which doesn't dissatisfy the customers. With the name "grande" there is nothing you will find grande about it. Can anybody tell me what can I do about it. Is there a way to send this car back to the Fiat people and get my money back. Even the small cars of Maruti like Alto AC performance is better. I will suggest everyone to go for maruti rather then Fiat.