Employer giving notice at short period to senior manager

I am working as Engineering head (regular employee- senior manager) with a reputed mnc company for 11 years in mumbai. I am 56 yeras old. I was planning to retire with this company. I have got good connect with the senior management. There are some changes at my senior management level, new people joinning recently. I have been told to find a new juob at short notice. I have given back to the company in terms of good service. new process improvements, awards. digitalization initiatives and awards. I have complimentary mails from senior management team at Corporate, Business , and HR level and also from International forums - US, UK . What is the legal advise for me - the company can force such condition; if i accept what should be the compensation package eligible.