He is certainly facing an issue, which is why he is chasing you without keeping his boss in loop.
If you are unwilling to tender notice pay then you may submit a clear reply in writing.
Notice period can be waived off.
If you prefer a verbal communication then one day he may have to refer to legal cell.
If you receive a notice you can reply FNF a/c as decided and firmed up in office has been settled.
The notice period/pay is part of service conditions and is stated in standing orders (Certified/Model) applicable to the company and extended to the designation of employee, which have statutory force and being instrument of law shall always prevail upon any private agreement that employer might have signed with employee e.g......................................appointment letter/contract of appointment/service agreement/bond etc........................
The employer (owner/MD etc) is personally held responsible for faithful observance of standing orders.
The notice period/pay is also stated in Shops and Commercial Establishments Act of the state and applicable to the establishment.
It is not more than 1 month in these enactments.
If you are covered by these enactments then you may have another avenue for relief.
Approach your lawyer.