Builder — high transfer fees for share certificate

Address:

Ahmedabad, Gujarat, 382443

Plz help me as just now i've completed the loan and document process for flat and at the last movement bank required one noc from society on the name of seller and when we approach the builder to provide it then he is asking to give 1 lack rs to him and transfer the shares on buyer's name only after that he will provide it, where i've to go to cross check that whether he is asking for correct fees or not and if he is asking wrong amount then where i've to go as during the entire process i've spent all funds and now the builder is not supporting. Building age is approx 20 years old.

Plz suggest me what to do now.