Received the same phone call today - "second attempt to contact, federal crime, must appear before a magistrate", etc. Not a live person, but a recorded message.  I recorded the message and sent an email with the call attached to the Maryland Attorney General - Consumer Protection Division (Consumer@oag.state.md.us).

I received this grammatically atrocious call today and laughed out loud. It could not be a more obvious attempt at fraud. Federal magistrates do not arrest, they are judges at the lowest level of the federal court system. I notice they blocked their number but gave this number to call in the voice message. Come on, you silly [***], call again. I'd love to play with your empty heads.

robo call said i committed a federal criminal offense, & they were turning over to  a magistrate/federal agent would be contacting me before a federal grand jury. for me to call them back ! You would think stupid people would have something better to do with their time. STUPID STUPID STUPID !!!

Played along for 20 mins, I've called them numerous times to show them they can eat a !?$%! Why do I find this so amusing! Why can't our govt do anything about this?

I agree with Chris and have just gotten another call/recording from this number.  Doesn't anyone care about doing something to catch these thieves?  If I knew what to do, I would certainly do it.  I am on the do not call list, but a lot of good that does.  We need these criminals stopped.  I am pretty sure that a lot of older people do not know that it is a scam, so therefore, it is criminal, and has to be stopped!