PF

For the sake of Industrial Laws, such as Bonus, PF, Gratuity etc. where the number of workmen are involved and profit sharing is concerned, both factory and Office are ONE concern. This has been well settled by Supreme Court. for Gratuity, you need not file a complaint. Send a notice to the employer as per Payment of Gratuity Act claiming the Gratuity payable to you and if the employer does not pay you can file a claim before the Authority appointed under the Act who generally is a senior officer from the labour department. After investigation he will issue a certificate of recovery  and it will be recovered as arrears of revenue and given to you. 

As far as Provident Fund is concerned you have to file a claim before the Regional Provident Fund as per provisions of EPF Rules.