You have served the company for the period mentioned in bond.
Your services are confirmed. The notice period is 3 months as in your appointment letter.
You can tender notice of resignation/notice pay in lieu of notice period for the period of shortfall in notice period.
You may mention the notice period/effective date of resignation/last day in office in your notice of resignation addressed to god offices of your appointing authority, MD {send thru redg. post under acknowledgment} and affirm that notice pay in lieu of shortfall in notice as per clause number….in appointment letter dated…..issued to you, may be adjusted in FNF statement and request to supply you acknowledgment of notice of resignation immediately and advice you to whom you should handover the charge and company property and designated official may be advised to supply you the acknowledgment on the spot.
Be skillful to obtain reply in writing, and record {audio/visual. Keep witness.} if you are coerced/forced.
You may proceed as per reply of the company.