I got the same thing... I usually don't answer calls at work, but I did this time because I hate seeing a number I don't recognize and then don't get any Google hits later. The call came in 10 minutes ago, on my mobile phone which is of course unpublished; I said, "Hello?"... silence... "Hello?" once more, and I got a surprised-sounding "Uh, hi." Then it sounded like the call was breaking or something because there was abruptly no sound. I hung up. Very strange, and now I'm dying of curiosity! I'm living in Chicago, and the area code was a St. Louis number.
I didn't answer call, but a message was left urging me to call 800 676 9314 and the name he left was Rick Morgan, something about lowering interest payments on credit card payments. Sounds like a scam