Can my company change notice period without my consent via email

I am working with an MNC company. In my appointment letter the clause "Termination of service" was (“Following a satisfactory completion of the probationary period in writing, this appointment is terminable by either the company or myself appointment is terminable by giving three month notice period or last drawn basic salary in lieu thereof, without assigning any reason on either side”.) this agreement was signed between me and my company on 3rd Jan 2011. But on 6th June 2022 my company circulate an email as below: Please be informed that in view of current business requirement. It is hereby notify that clause 10 of the employment agreement (Appointment letter) is amended as follows: 10. TERMINATION OF SERVICE “Following a satisfactory completion of the probationary period in writing, this appointment is terminable by giving three months’ notice by you only, and the company can give three months’ or last drawn basic salary in lieu thereof, without assigning any reason on either side. The Company can however, at its discretion, waive off the notice period. Pls acknowledge your acceptance by responding to this email. In this email company change rule regarding notice period but they clearly mentioned that give your consent by responding this email. But still I didn't accept or reply the said email. But right now my company enforce me to complete 3 month notice period as per new rule. As I think because I didn't accept new rule so it will not implement on my case until I accept this. Please guide me on this....