Compelled to serve 3 months notice period

I am a permanent employee of auto mobile industry. While signing appointment agreement is as follows " Either I have to serve 3 months notice period or payment in lieu of notice period if my Department head gives a written confirmation" But I am serving 1 month 25 days notice period now and was able to extend my new offer till two months period. I have been turned back and forth by my current organization. They have released a compulsory 3 months notice period circular by managing director as my company is facing massive count of resignation. So my department head is not willing to sign by just indicating me the circular and every other employee serving the compulsory 3 month notice period may ask for quick relieving. I was just frustrated because of the 3 month notice period becoz I was not handling a project whole or acting as a manager. 1) my current office has a old recruitment policy. 2) people who are getting offers are not joining. 3) people who are in are getting out because of bad policy. How can I get out from this situation. It's bizzare they tell now they need to run the department. While they outnumbered every team with human resource optimisation before 6 months.