This is a scam. They called me 3 times today and when I finally answered he was a foreigner with trouble speaking English working in a call center with a lot of back ground noise. After I said hello the first thing he said was "Can I ask you a question." When I asked who this was, he repeated "Can I ask you a question" and I asked again who this was the he said he was with the US Government Department of Grants but refused to give his name or how he got my info.
The other posts refers to money & Taxes, the IRS and now US Government Department of Grants.