Here is what the REAL U.S. Treasury Department web site says about these calls:

https://www.treasury.gov/about/organizational ... rts_index2.aspx

Scammers call an individual asserting that the individual has been awarded a grant or a similar sum of money and request personal information or a sum of money to “release” the funds.   The Treasury does not have such a program.

Likewise, e-mails promising a sum of money and purporting to be from the Treasury Secretary or his staff are false.

We urge recipients of such calls or e-mails to be extremely wary of any scheme requiring an advance payment for a later promise of funds—these are hallmarks of scams.

A similar scam is a caller falsely representing that he is from the Internal Revenue Service or impersonating an investigator from this Office and demanding payment or information.  These callers have been described as threatening or abusive, and tell victims they need to make immediate payment to forestall arrest.

THESE ARE FRAUDS.  PLEASE EXERCISE CAUTION IN YOUR DEALINGS WITH ANYONE PURPORTING TO BE FROM A GOVERNMENT AGENCY AND DEMANDING MONEY OR INFORMATION.