Maruti Swift VDI
New car Knocking, A.C air leakage & wiper defective

I purchased car on 30.09.2008 from RKBK Gorakhpur & on the other day i found that the car is knocking seiverly, the A.C air system is having a leakage problem also the wiper is defective & has put some streckes on the front glass. I am so shocked by this car. I donot Know that this is a PDI Problem or some thing from the company side.