I call the fake IRS ones back, as they have been using robo calls leaving a number. So I call them back and say, "This is the IRS, and you just called our hello line when you left your phone number at. Just to let you know, we do not call anyone, but we will send out letters advising of a tax dept and or audit. So who there would like to go to jail, for impersonation of an IRS Agent?"
The guy's response - Your Momma in a Pakistani accent