Fiat Punto Active Car — defective delivery

Address: Bangalore, Karnataka

I k.s.handragal purchased fiat punto car engine no 0022726 from prerana motors rajajinagar bangalore but from the delivery the vehicle was defective and rusted in one of the doors I talked to the dealer but he was not responding after complaining to the fiat company the dealer is now ready to change the door but why should I take defective car after paying my hard earned money please help me to get brand new car as I paid for new car.