>>> What is this establishment: Commercial, Industrial, Small Enterprise?
The registration certificate is displayed near entrance or you may find out yourself.
You are located in which state?
Redg. office of the company is located in which state?
How many employees are employed in it?
What is line of business of the company e.g. IT, banking etc…………?
What is your designation and nature of duties?
Are you a member of Employees Unions?
>>> You may write to the Group Head, Director (with a copy to good offices of appointing authority, MD, Chairman, and Head-HR) that you had met them in person in office to submit by hand, your notice of resignation dated…………………………with notice period of ………………………….days stated in it in line with clause number…………………………of appointment letter dated………………………issued to you, on dated……………………………in office, and the notice of resignation was seen by them and matter was discussed………………………..and on dated……………………..they have accepted the notice of resignation in original from you.
The same was to be forwarded to ………………….HO and the copy of the communication vide which this has been sent be supplied to you and you should be appraised to whom you should handover the charge within and upto the expiry of notice period tendered by you…………..
If they do not reply:
You may submit copy of the resignation to good offices of appointing authority, MD, with a copy to Head-HR…………………………….attach copy of notice of resignation submitted by you, and point out that it has been routed thru …………………………….. you have tendered 30 days notice period vide notice of resignation dated…………………………..NO tasks are pending at your end as on date…………………………….and routine duties be assigned to you that can be completed on day to day basis within and up to dated………………………..i.e. expiry of 30 days of notice period……………………and all arrangements be made to complete the exit formalities/KT etc within and upto expiry of notice period tendered by you and to whom you should handover the charge within and upto expiry of notice period i.e dated……………………………
During this period you should successfully build written record with a copy to you and under proper acknowledgment and keep in touch with elders in the family, competent and experienced well wishers, and preferably a competent and experienced Labor Consultant/Service Lawyer…………………………and proceed under their wise counsel and advise.
Resignation is personal mater and communications should be preferably sent by letter thru redg. post and can also be sent from personal email id…………………………followed by letter thru redg. post…………………
You may go thru another similar thread and you would know the points to cover……………….
https://www.lawyersclubindia.com/experts/Employer-not-giving-relieving-letter-476871.asp#.U5fzBHKSwb8
Download all relevant policies, communications, mails etc as they may block it anytime.