You have not replied to all points pointwise.
Had you replied, some inputs could have been passed on to you.
The company seems to have processes the salary, dues and that is why it has issued all salary slips and Form16 and has not released the dues and FnF statement.
You may check if salary slips and Form16 are correct.
You may approach a very able counsel specializing in Labor/service matters and under expert guidance of your counsel you may submit final representation to good offices of appointing authority, MD and narrate all representatiosn made so far (mention dates, names, brief minutes.....and promises made to supply the dues ) ................
Your counsel may opine, if covered, to approach;
Inspector appointed under Shops & Estbs Act
Payment of Wages Act
O/o Labor Commissioner
Civil Court
Lodge complaint u/s 406,420
File winding up petition