Law of Limitation to file gratuity claim under NCLT

My past employer has not paid my gratuity dues payable to me for 12 years of service even after 5 years from the date of issue if relieving letter. Few reminders sent were also not replied and it seems they have no intention to pay. As per Labour Commissioner , there is no time limit to claim gratuity. Will NCLT admit such claims for gratuity dues stating reason as time barred case since law of Limitation under NCLT is only 3 years