Sir if the company is in NCLT and the moratorium is passed and IRP is appointed in that case file a claim for the dues of the gratuity in prescribed form as workmen the NCLT shall consider you as operational creditor and from liquidating the company they will try to pay off your debts and full and final settlement.
http://www.vnril.com/pdf/schedule-of-claim-forms.pdf refer page 7 form D for the claim form same has to be filed and submitted with IRP within 15 days of the moratorium order is passed.