Didn't answer, but I've had three calls from three different numbers from three different locations in Texas. I don't know anyone from Texas...I live clear across the country!
To report the fraud, go here:
http://www.grants.gov/web/grants/support/general-support/grant-fraud.html
Their number is listed , along with an email address, at the top of the page.
Also here:
http://www.consumer.ftc.gov/articles/0113-government-grant-scams