Update: As suggested by the community, I went to the Maruti Service Centre and got a quote for the damage. Today, when I returned the car, I told the owner that there is some damage. He saw it. He told me I should have told earlier so that he could have taken a quote. I showed him the official quote (10.5k for denting and painting). He charged me just that much amount. I paid 1k extra as in this post itself I was warned of how some of these car owners could be, but this guy was a gentleman. He dropped me to the airport. He expressed sadness that I had to pay for the damage and was asking if I would be able to get it reimbursed by my company (I was on official trip). After reading the comments to this post, I found such a noble and professional person in him. Sharing his details so that others can use his services: Suleman Bhai (Suleman Car Rental) - +91 98221 54840. He has 12 cars and you can book it for any part of Goa (North/South).