Hi
1) Solutions to get the dues from the company:-
Since the monies are owed by the company to its directors(Accounts of 2015-2016 wherein it is mentioned that dues from companies to its promoters is more than 1 crore), as a rule , special general body meeting should be called for and the remaining directors should pass a resolution to release the money to the directors.
Ideally you should file a petition for mismanagement u/s 241 and 242 of companies act before the national company law tribunal
2) Withdrawal of equity:-
Since you intend to withdraw the equity, you should first ask the existing promoters to buy your shares (either at book value/ premium to book value) as the existing promoters generally have the first right of refusal.
If after 30 days of notice , the existing promoters do not express their willingness to buy the shares, you can sell the same to any other person by way of private treaty.
Since it is a private limited company, in case you do not get an alternative buyer, you can approach national company law tribunal u/s 242 of companies act.
For your queries 1,2,4, 5,6 approaching NATIONAL COMPANY LAW TRIBUNAL u/s 241 and 242 of companies act is the legal remedy.
3)In the event of not filing returns A director of the company can be punished if the company has not been filed even after 270 days from the date when the company should have originally filed with additional penalty.
Any Director who has defaulted in the filing of annual return of a company can also be penalized with an imprisonment of a term extended up to six months or with a fine of an amount not lesser than fifty thousand rupees and it might extend up to five lakh rupees, or with both imprisonment and fine.
An alternative could be filing a civil suit in District court against the promoters under money recovery suit , but i am afraid, in case you go to civil court, the existing promoters in turn may go to NCLT .
So the best option could be approaching NCLT only
Hope this information is useful.