100 days is heavy delay.
The time for payment of FNF dues is usual pay.
What is this establishment: Commercial or Industrial?
You are located in which state and Redg. office of the company is in which state?
It companies are covered by Shops and Commercial Establishments Act of the state and one of the duties of the Inspector under this Act is to ensure the accounts of the resigned employee are properly settled.
You can obtain the contact details from local o/o Labor commissioner.
The employee in such a situation may approach:
Lawyer/Law firm
Trade Union Leaders
O/o Labor commissioner ( if covered as workman as in ID Act)
Inspector under Shops and Commercial Establishments Act ( if covered as employee as in the Act)
Inspector under Payment of Wages Act (applicable to all employees drawing wages as per def. of wages as in the Act up to Rs. 180000/pm)
Civil Court
There are threads to indicate employees have been contemplating to lodge criminal complaint under sec 406/420………………………..and approach employers as Creditors treating the employer as Debtor and unpaid wages as debt on employer…………….
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