[Resolved]  Fiat - Palio 1. 6 Sport — Rusting on my dicky

I purchased a Palio 1.6 sport in Oct 2006. It is less than 3 years and I see some major rusting on my dicky. I had raised a complaint of water leakage through my dicky after the first monsoon in 2007. I am sure this is manufacturing defect. I have now noticed that the sealing on the door is coming off due to rusting. I did take the issue up with Fiat, they put me on to their dealer. I want to know the root cause for the rusting (if it is not manufacturing defect). I know for sure that a new vehicle should not rust within 3 years considering the coating of rust preventive (dipped in a tank) given before painting the vehicle. What is really troubling me is that there is no one willing to come out with the root cause analysis and take responsibility for the issue. If it is my fault, I do not mind getting it rectified at my cost. Else, I want Fiat to take the responsibility for the root cause analysis and come out with the report.