Submit a representation to the appointing authority, MD, Company Secretary with detail of the events date wise and ask their good office to intervene and to supply you by registered post...........the F&F, salary, Form 16, with in 15days.
If they do not approach your local lawyer/law firm with all docs and send a legal notice.
Lodge a complaint with local office of labor commissioner. This should help.
Hope you have given notice of resignation, calculated the amounts payable by you e.g. notice pay, refund of advance/imprested cash etc if any, and amounts payable to you.