They call me too. Twice now I believe. Both times they left me a message one was 30 secs long and this guy with an accent kept saying hello and it sound like he was in a bar or some busy place, the other was like 3 mins long and it was just blank.
They called me and said it was for a loan for ten thousand dollars. They said I wouldn't have to pay it back or pay taxes on it. Last time I checked a loan is something you pay back. Definitely a scam.