I was just called too about some IRS court garbage. Telling me I have court in the morning. I told him to subpoena me and my attorney. He said ok and hung up. Looks like the messages on this site are in time sequence so they must be calling from a list.
Robotic female voice, left a message. Said this is a second attempt to contact me about a federal criminal offense. Said if I don't return the call, all she an do is "wish you a good luck, as the situation unfolds on you."
Obviously a scam, and I'm guessing not based in the US.