I might be late in responding but for such scratches the best you can do is ignore them. I know its tough but... Indian laws are not that rigid that would trial someone for damaging ones property.
If you don't have personal parking at your home then I suspect the incident could have happened there itself.
Point to note, repainting for such a small thing will decrease the resale value as its next to impossible to match the colour tones considering the time factor as well of the new colour vis a vis the old one. I don't think insurance companies will even budge for such an issue.
Wait it out: what might the same area of scratch gets some more beating so that it could get covered under insurance or sell your car after sometime.
In a nutshell, don't go for a paint job for such a minor issue and don't frown. There are people who still dream of owning a car, you my friend already have one.
Just chill, thats the best we could.