Mr. Dalmia has given valuable advice. Kindly follow it.
You have posted that :
--"I was forced to resign immediately" "I was told to submit my resignation mentioning as irregularity".
If no irregularity was committed by you, you should not have signed a dictated resignation. You could have withdrawn the resignation. Forced resignation is deemed termination.
Did company ever level any charge and issue stinker/notice/show cause notice/legal notice and conduct any enquiry?
Natural justice is denied and resignation is extracted within walls of the office of the company.
It is felt that the company and its officials might have inserted documents suitable to them in your personnel file and since grave charge (of irregularity) is mentioned company may not settle you’re a/c easily and may not grant reasons in print.
The adverse comments posted in your personnel file (if any) may affect you in future.
You may request the company in writing under acknowledgment to let you examine your personnel file and ask for an appointment in writing. This communication can prove to be useful at appropriate time in appropriate forum.
It is felt that company has not supplied the FNF statement to you.
--“The only reply I get is that “we will settle shortly"
Is this reply issued in writing?
In a given situation employee can invoke the provisions of Industrial Employment Standing Orders Act, SE act applicable to the state, Payment of Wages Act, ID act as per explanation of employee under these enactments or approach civil court.
The termination is initiated by the company (by extracting resignation) and ideally company should have handed over the due documents and payment of dues e.g. FNF statement, FNF payment, acceptance of resignation, work experience/service certificate, relieving letter (chances are low for this), form 16, NOC/NDC, attested copies of PF transfer/withdrawal forms, etc by now.
It may not be surprising if the company produces some document labeled as enquiry report, statement of co employees, superiors and claim that loss has been caused by you.
It is important to obtain the stand of the company in writing. Therefore if you are not able to succeed with your efforts you may approach a competent and experienced service lawyer and submit structured communications addressed to good offices of your appointing authority, MD, CEO, Company Secretary , narrating the incidences and all representations made by you so far in person, by phone, by email etc. with date of each representation. It is felt that you should mention that resignation was extracted under coercion however you may kindly decide in consultation with your lawyer if you want to mention that resignation was forced resignation. Your lawyer may firm up the strategy as per inputs given by you. Be honest with your lawyer. Your lawyer may prefer to issue legal notice.