Dear Balkishanlal,
There are two things you have to understand in this case.
First Point of Consideration
First, if they terminate you, then your entire career will become a big question mark. But you will get all the benefits, including notice pay and other monetary benefits.
Second Point of Consideration
Second, if you submit the resignation letter, you cannot claim anything except your PF and leave encashment as per the company policy.
Do you have any proof to prove in court that you have been forced by the management to submit the resignation letter?
Have you mentioned in the resignation letter that "As per your advice, I am submitting my resignation letter" or words to that effect? If so, you can go to court.
Now, before approaching the court of law, please send a letter to your old company stating, "As advised by you, I have submitted my resignation letter. Please release my 3 months' notice, LTA, gratuity, and other benefits as per my eligibility."
If they give some reply, then you can keep the same as your record, and you can knock on the doors of the Court of Law.
With warm regards,
S. Bhaskar
[Phone Number Removed For Privacy Reasons]