HDFC Bank - Home Loan — bank is not releasing the stamp paper for most registration

Dear sir,

I had availed home loan from hdfc hfl in the year 2016. They said i need to give stamp paper worth rs 22500 for doing modt registration and i had given the same to the bank officials. When the house documents were registered, the stamp paper was not released for modt registration. I requested several times by sending emails and calling them but till not the stamp paper is not released. They are now saying it may be with the builder and although its not my duty to check with the builder, i had checked with the builder and they too confirmed that the stamp paper is not with them. Could you please help me in getting the stamp paper released at the earliest so that i can do modt registration.

My loan account number is:[protected]

Thanks,
Srinivasan