I also got a a call from this number that I didn't answer, and I hate to bust on you, but "didn't take a risk???????"
Do you realize that you are part of the whole problem? There is NO RISK. Risk means that there is some chance of the situation being something positive. Have you EVER gotten an unsolicted phone call on your cell or your land line that was for something worthwhile? If no one ever takes the "deal" that they are offering, they will have to shut down. People who do, perpetuate the problem.
They called me too and left no voicemail.
I called back and it rang once, then it was a busy signal.
I thought maybe it was a bill collector or something?