Company has changed Notice Period Policy -I have not accepted this formally - Am I bound by the new terms?

Manav11
Hi,
I am working in IT sector. I joined my company in Jan 2014. In my appointment letter, it says -
'It is understood and agreed that this appointment, after confirmation, may be terminated by either party by giving to the other at any time, notice in writing of one month. The termination shall take effect at the end of such notice period.
Other Terms and Conditions
During your employment, you will be subject to the service rules, regulations and policy of the company applicable from time to time.
The terms and condition contained herein shall be read along with the instruction, guidelines. policies etc, and amendments thereof as presently applicable to you and as may be amended from time to time and as may be made applicable to you by the company subsequently during the course of your employment.'
In Jan 2017, Company has revised the policy and notice period has increased from 60 days to 90 days. Now HR is forcing me to serve notice period of 90 days because policy has changed.
Neither did I get any communication from HR Mail/ Updated appointment letter nor did I acknowledge this at that time either mail or signed document.
what should i do?
Company can declare me absconding if I serve notice of only 60 days.
How can I complete my FNF reliving letter?
I tried to convince HR Head but she is not accepting this. She is forcing me to serve 90 days notice period?
what should i do?
Please Suggest......
manojkamble
Dear Manav,
As you said, if you have not signed or acknowledge the notice period clause then no one can force you to serve 90 days notice period. Try to convey the same to HR department and if they are not ready for the same then you can approach labour office in your area for the more assistance.
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