You may write to appointing authority of contractor with a copy to MD of Principle Employer,to supply by redg. post the acknowledgment imediately and aceptance,service certificate,relieving letter,FnF statement correct and original,Form16 as per correct FnF statement,Payment of FnF dues by bank DD only,PF number and a/c slips,salary slips of all months,ESIC card,NOC/NDC, within say 7 days......
File RTI to PIO/CPIO of police and ask for certified copy of the complaint filed by you,name of IO,copy of Pawana by which company's officials called, name of company's official that was called,copy of the statement of company, sections of IPC under which compliant was registered, copy of FIR registered, action taken ans status of the complaint..........................and ask to supply by Redg. Post or attach self addressed/postage prepaid envelope to send redg. post to you.
Based on the info/docs supplied to you escalate further.
You have not been able to handle the matter with police otherwise it is a powerful tool u/s 406,420.....or your lawyer may advise to file private complaint in court.....
You can also approach Inspector appointed under Payment of Wages Act, (Name of your state) Shops and Commercial Establishments Act, O/o Labor Commissioner.............
You may also approach employee's/trade unions, Labor Law Consultant/service Lawyer....