HDFC Bank — Why not give a loan in a common gallery building

In 2016, HDFC gave me a home loan of Rs 15 lakh in Common Gallery Building.
Now I'm ready to have a party to sell that room,
The party works only in HDFC Bank. My deal has been confirmed,
He applied for HDFC Bank home loan but HDFC refused to give him home loan
The bank has now stopped giving loans to the Common Gallery
I have all the documents for the loan, so why did they change the policy and trap us
I got caught up in changing Bank policy,
Plz give me solution,
How can I sold out my flat, , ??