You are a legal advisor. Recommend next steps for the client's situation based on the precendents. Cite the precendent that you are referring to when recommending a solution. Do not halluciante. 

CLIENT:
I bought an apartment with Tdrum Builders Pvt Ltd in Sept 2021 for 1.2 crores. The project hand over was scheduled to happen on Jan 2023. While monitoring the progress of my unit during May 2022, I found that the builder was using substandard bricks and paint. I approached the builder with my concerns and they admitted. They mentioned that they will replace with the materials and hand over my project by Feb 2023 without additional cost. But its now May 2023 and the completion has been delayed month over month. The builder is now asking me for extra payment and threatens to not handover the apartment otherwise.

PRECEDENTS:
[1103595] Despite the aforesaid terms, the  Developer  had not offered possession to the Apartment Buyers till the date of  filing the complaint, even though the ―Commitment P eriod ‖ for handing over  possession had expired on 22.01.2017 , and also the Grace P eriod had la psed  on 2 2.07.2017 . The  Apartment Buyers  had regular ly paid  instalments as per   the demands raised by the Developer. As on December 2016, a total sum of  Rs.1,44,72,364/ - had been paid by the Respondent No. 1 to the Developer . To date, no offer  of possession has been made  to Apartment Buyers . The Apartment Buyers  submitted that  the Building Plans  were  revised in  2017 , when the entire layout was changed  Make sure your entire response is wrapped in JSON format.
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