In 2004 or 2005 my Palio had its roof paint losing colour and fading slowly over a period of weeks. The first time I went to Sundaram Fiat after this happened was for some other work but I showed it to them as the car was under warranty and they acknowledged it. Once it became really bad after a month I think, I requested for free re-painting of the entire roof under warranty to Sundaram Fiat and after some discussion they offered to re-paint but for a nominal charge of Rs.500. I agreed and got it re-painted. Sundaram is no longer in the picture so out of RDC and Ramkay, I would suggest Ramkay without a doubt. Escalate the issue so that you can get a discount but you will have to pay for the painting.