You can't do anything to require the police to investigate. If you are doing all of this without an attorney, it is unlikely to end well for you.

Absent some form of injury that warrants retaining a lawyer, you are entitled to a refund.

I don't see any grounds for a lawsuit based on what you described here.

That is up to her parents and your parents.

None of us knows the laws of India.

I hope and pray you are not contemplating doing a jury trial without an attorney. It won't go well.

If you don't go back I assume they will fire you. As they can.

We can't tell you whether you should be worried.

Have you asked your Landlord if they will let you out of your lease?

This is a Q&A forum for simple legal questions, not a substitute for a PI or your own attorney.