I too received a call from this number claiming that I had been chosen to receive a 7,000 dollar grant from the U.S government because I paid my taxes on time this year. All I needed to do was give them my bank info and they could transfer it to my account but there were stipulations on what the grant could be spent on. So I told them that I was at work and would like more information on this "grant" and since they already had my address, which they confirmed when I first answered the phone, I told them to mail me the info so I could look it over and haven't heard back from them since! These people are ridiculous, fortunately I and seemingly most of the people on here are not falling for their scam, but so many others do and something needs to be done about it.
It is a scam. They are a foreign operation which has bought a SKYPE or Voip number with a 202 area code, trying to look legitimate to Americans. The number does not exist and there is no one on the other side if your try to call.
With any of these scams, you simply look online and stall them. Then, as I did, begin to spout off the infractions and complaints listed on them and request to get detailed information as you are filling out an FBI report. For some reason, they hung up and never called back. Go figure.