@Pallavi I have asked this question myself what if you don't have wealth, power etc..I was feeling bad about thinking cant a common man get justice. And to get answer to my question I did turn to mythology and lo and behold the answer was there.
First let us take Ramayana. Sita is abducted by Ravana. Even for her search Ram had to strike an alliance with Sugreeva killing bali. The search as well as the support for crossing the ocean along with the army for figting the war is given by Sugreeva. So Ram did had to strike an alliance with Sugreeva for the final victory. 2 nomads Ram and Lakshman were no match for Ravan. Even in the end of Ramayana war if you see Lord Indra sends his chariot to Ram to make it a fight of equals. So Gods also help because they also want Ravan to be defeated.
Now let us take MB. If you see post Varanavath Pandavas have no identity till Panchali puts the varmala for Arjun. They come back to claim their throne after getting a ally in Panchal king post marriage. Again they create alliance with Virat king using marriage. Abhimanyu son of Arjun marries uttara daughter of virat king. So to fight the mighty Kauravas Pandavas also create alliance with like minded people. Even Krishna is part of the alliance as in real terms Krishna is Pandavas cousin.
So what I understood is that to fight a war against wealthy and mightly you have to create alliances. You cannot fight a battle of unequals. Nithya could have fought. But instead of taking head on she should have thought about creating alliances. Should have tried to dig out people who had grudge against Goenka's. Should have approached NGOs who are working for the cause etc etc.. than expecting everyone to be truthful.
Even if you look at Dev he was a non entity till he got Durga's varmala. It is by getting a support of Dr Dayal he finally comes to reckon. So in fight of justice or whatever I believe it has to be that of equals and that is clear from mythology. If you feel fighting an unequal battle find ways to make it a equal battle than blindly take head on.