Received a call on my cell.

Robocall claims to have an IRS warrant for failure to pay. Please call this number immediately. I called the number back and some voice with a bunch of chatter in the background wanted me to identify the nature of my call.

Stop it!  You falsely claim IRS has some case against me, which, fortunately I know they don't.  These people should be arrested NOW!  I get messages twice a day.  Maybe a few with fifteen years in jail might think again.  Can't an undercover take them down.  Come on!