Dear Emotion friends,
The builder is still playing with us. The recent example is GST on its projects. Please read the article from Institute of Company Secretaries (ICSI) and it will be clear that GST is not applicable to Real Estate and they are planning to bring it in the ambit of GST in November 2017 meeting of the GST Council.
Thereafter, we can decide how to take up the matter with builder. 
Regards