I think they have it backwards

If someone asked you to give them some money and told you they'd give you 10% on it every month and you

- actually believed them
- never asked them for details about how they were going to do this
- gave them the money
- went to file an FIR when you soon stopped getting anything

and I was the person in charge of registering your complaint, I would either

- laugh my head off at your stupidity
- arrest you for your greed (how did you think you were going to get returns like this and even if you had been given some cockamamie story, then go back and read the line above).

Remember:
Big legitimate rewards involve big legitimate risks - if you partake and don't get your money back, don't go crying to people about it.
A trip to your local police chowki to complain about someone who absconded with your money is warranted only when they presented you with information that at least seemed legitimate when you invested.

I can't believe all these reports in the papers of bozos parting with huge sums of money to be doubled, tripled and quadrupled in a few months and then complaining about it when they realized they'd been 'duped'.