The procedure of filing complaint, for your specific facts please refer a labour lawyer.
1) Send a demand notice to your employer, either personally or through the Union you are member of.
2) give 15 days time.
3) If matter does not ssttle, the file a complaint before labour cum conciliation officer of the area where you worked. The officer will act as a arbitrator for amicable settlement of the dispute.
4) Still not satisfied, Labour concilliation officer will end you to the State labour commissioner. The commissioner may refer your case to labour tribunal depending upon your case.
These are the basic steps. Choose your proceeding wisely and it is always advisable to hire a lawyer.