I'm calling regarding an enforcement action executed by the US Treasury requiring your serious attention. Ignoring this will be an intentional attempt to avoid initial appearance before a magistrate judge or Grand Jury for a federal criminal offense. My number is 302-279-3069. I repeat 302-279-3069. I advise you to cooperate with us and help us to help you. Thank you.I especially like the "help us to help you" part. This is basically the same phone scam reported by many others in tax seasons.
I encourage anyone with free time to give this number a call (dial *67 before you call them to mask your caller ID). If they're on the phone with you, then they won't be on the phone with some poor person that they've tricked.