I received a call from this number, The man left me a message saying was IRS. Said they had a case number and an arrest warrant. Call them back at this number, "an agent will be waiting for my call".
I did try, but message said I had reached a non-working number.

I got that same message on march  27,but it was an man on voice mail called just rang but the number was 305-501-2183 Then on march 29 I received an voicemail from an woman saying Aganist u are before anything goes wrong are before we track down your case file to your local police department.In order to get arrested on these charges.I want u to call us back as soon as possible at my department call back number which is 607-203-0953 I repeat 607-203-0953 this is Nancy Again from Investigation Department of Internal Revenue Service Thank you.

I just received the same message but when I called it back it's was disconnected

I have received the same call as terry. I have received the same call from several numbers 276-221-0622 on march 24th, 607-203-0953 on march 27th, 573-391-1240 on April 20th, 908-219-8848 on April 21st, and 408-809-3468 today.  I didn't realize it was different numbers until today when I started looking up the number from today which was from San Jose California.  I also noticed that at least 2 of the times my phone never rang it just popped up with a voicemail.