I never heard these kind of schemes but this way of scamming is too obvious. People who fall for this traps are just plain foolish. Well, if you have received phone calls from an anonymous person, the first impression will always be doubt. At this moment, you will begin to identify whether he is telling the truth or not. If you haven't joined something like a campaign of you havent invested on something,then there is no reason for someone who will call you like that.