Lodha Group — Agreement value is not reducing after Govt reduce the Stamp duty

Address:

Thane, Majiwada

My booking for 2Bhk is done on 09 august at 79.50 Lac in which GST, Registration and Stamp Duty(6%) is included.
on 20th August Maharashtra Govt. declare the Reduction in Stamp Duty from 1 sept. and Lodha here delayed the registration process to get this benefit.

Govt reduce the Stamp duty in Public welfare not for Builder Welfare. Lodha is not ready to reduce the agreement value. Lodha now saying that Stamp duty is lodha paying so customer cant get this benefits.
Lodha no where mentioned during booking that lodha is paying stamp duty, its said to me the Cost is all inclusive, where all Stamp Duty, GST, Registration is part of this price.
As till now Registration is not done then i am claiming this refund or adjustment in Agreement but Lodha denies.
I have escalated it to CEO of Lodha group but no positive response on same.
please help me in this.