First of all show the finger to the desi company!!

Try to talk thing out...i know that usually desi company have desi lawyers so they think they can jointly victimize ppl left and right. They are predidators but you can protect yourself.

Second, ask them to send you a copy of contract. Get a probono lawyer and fight it out. These companies try to do intemidating things like this to scare you off and they expect you to give in. If you have any emails or any records of writted communication indicating that they had offered free training, save it.( i doubt if you have anythign as they are vv careful about this). YEs document every service they have provided you.

Even if they take you to the court ..I dont think that the contract will be binding as you dont have any work authorization anymore. I am sure the judge will see this as modern day glorified slavery and decision will be in your favor. dont worry. Talk to them saying that if they take them to court , you will expose all the illegal activities they are doing. Try to convince them that you will come back after OPT.

I really dont think that they will take you to court.