The first number will call first and tell you about a government grant because you pay your bills and are not a felon, get your card number/ routing number and account number, tell you that you won between $8,000-$10,000 the only thing you have to do is go get a Steam gift card for $350 and the money will go into your account. note that there were a lot of people in the back ground!
They will say they are part of the U.S. Department of Health and Human Services don't fall for this it is a scam!
Link to Steam Forum about it - https://steamcommunity.com/discussions/forum/1/2595630410191125432/