Hope you have submitted all company property including ID card, etc. and has obtained duly signed and stamped NOC/NDC/acknowledgment.
Please study the terms of termination of service in your appointment letter and post in the forum what does it state.
If it is mentioned after confirmation of service notice period is 2 months or salary (basic/gross/CTC) in lieu of salary then your liability is only up to the amount equivalent to balance number of days, and therefore you can ask the company in writing by letter to supply you the acceptance of your resignation and deduct one month notice pay in your F&F ,from your payable dues and earned leave etc, and supply you by registered post, the F&F,form16,work experience certificate, relieving letter, NOC/NDC,PF accumulation report, PF withdrawal/transfer forms , payment of dues, etc.
If you are facing any difficulty you may submit letter by registered post/speed post with AD or at the desk in your company where all mail of the company is received and obtain acknowledgment with seal and signature on the copy of your letter,
addressed to, your appointing authority, MD, Company Secretary, and mention that as per terms of employment mentioned in your appointment letter you have submitted your notice of resignation dated........effective from dated..........and have communicated to Mr........(your reporting authority) and Mr.............(HR guy) on dated ..........and reminded on dated...........to deduct the notice pay for .days from your payment of your wages and dues in your F&F and despite your representations the following documents :
;acceptance of your resignation,F&F,form16,work experience certificate, relieving letter, NOC/NDC,PF accumulation report, PF withdrawal/transfer forms , payment of dues etc, have not been supplied to you therefore their good offices, are requested to intervene and supply you the documents and dues (say) within 15 days.
You can take the help of your elders in the family, experienced and competent people known to you and your family of your lawyer/law firm, to draft your letters.
If still they do not adhere to the terms of contract of employment you have the option to issue legal notice and thereafter complain to the local labor inspector.