Got a call, but deleted the vmail they left (by mistake). But, if it is someone claiming to be the IRS, I've had that call before and called them back. Pure scam, but fun to toy with.
If you get a call claiming to be from the U.S. government that threatens you with a court appearance or arrest, do not panic. This is a scam. So, do not worry in the least about these phony calls. Do not ever call them back, give them any kind of information, or send them money. Hang up! If the U.S. government has legitimate legal business with you, they will send a letter by registered mail.