Received the same call as the others. The guy said his name was "Walt Whitman" (?). Very thick accent and he explained that he was with the US Department of Human Health & Services. His partner uses this number:
202-738-4370. Do not accept calls from either.
Got a call from 202-200-0018 Same as the others. Thick accent. Something about $9000 grant. Lot of background noise, like on a street corner. Could hear someone else in the background talking. Told the caller to hold on a minute. His response was don't take too long. Hung up. DO NOT CALL BACK.
From those who have played along a little with the scammers it seems as if they are operating out of Jamaica or the Dominican Republic with a spoofed Washington, DC number. They either want you to get a Wal-Mart or CVS Green Dot Prepaid debit card or wire money via Western Union to a contact in one of those countries for the "processing fee". They also try for your banking information to "deposit" the grant. Like others have said, they need to up their game a bit, this scam is so transparent.