Actually left me a voicemail that was a computer generated type of text to voice message about the IRS putting out an arrest warrant on my name. Called back using *67 to block my caller ID and got hung up on after one call. Second call some guy just answered "Hello" and I hung up.
On March 15, 2017, I received a computer generated messsge stating the IRS is going to file charges against me and issue and aeeest warrant if I do not call back. I just laughed and ignored it.