This is Delhi where it took millions of e-mail petitions to the President and PM, and 7 years before they put away a politicians son who walked up to a lady bartender and shot her in the face. There is no justice for the man in the street, unless he knows someone, PERIOD.
This is why the DGCA is what it is and they do anything they like.
There are other ways to get your parents money back, in addition to those mentioned.