Hyundai Motor India — water leakage from the body shell inside the car

Address: Barnala, Punjab

I buy i20 mangna o in september 2011 and the problem that i am facing is that whenever i wash my car or during rain the water from the body shell leaks inside the car. This must be technical error because my car is in good condition but earlier i ignore this problem but now it become critical as water leakage increases very much. Please suggest me the solution, my contact number [protected] Leakage is due to some technical fault only because it is not possible that water can leak from upper body shell i side the car.