FIRST THEY DON'T UNDERSTAND GOVERNMENT DOES NOT WORK ON HOLIDAY.
INDIVIDUAL STATES HE IS AN IRS AGENT AND READS A BUNCH OF WORDS ABOUT IRS RULES AND TRYS TO GAIN INFORMATION FROM YOU THAT YOU ARE BEING AUDITED.  
ASK WHAT OFFICE HE WAS FROM AND TOLD ME WASHINGTON DC ASKED WHICH OFFICE AND HUNG UP ON ME.
CALLED BACK  AND MY NUMBER WAS BLOCKED SO I CALLED HIM ON MY CELL PHONE AND HE WENT ON TO TELL ME HE WAS IRS SPECIAL AGENT SO SO AND HE NEEDED ME TO PAY MY BACK TAXES OR THEY WOULD TAKE EVERYTHING EVEN MY BIRTHDAY.  SO AFTER I TOLD HIM I WORKED FOR IRS HE CUT MY CALL OFF. I REPORTED HIM TO THE CRIMINAL INVESTIGATION OFFICE AT IRS WITH HIS PHONE NUMBER.   HE WAS DUMB ENOUGH TO LEAVE A VOICE MESSAGE THAT WAS RECORDED FOR PLAYBACK

Got the call and experienced the similar thing today. I called back serveral times, they became impatient. they said they are ISIS and I think it could be true since they are the same stupid.

Just got a call from this number on my pre-paid cell phone at 5am.  First, a pre-paid cell phone has no name attached to it and its not legal for IRS or any agency to call at 5am.  Total scam!!!

Recorded message saying that a call from Revenue Department and need to pay the dues.  When I called back that number, it was not going through.

Same creepy voice, giving orders to call back and not to ignore phone call or they (IRS) would take action. LOL i have no pending matters with IRS. and would the IRS finish a message with "call back and take care"?