Got the same message - total scam - I've been through this drill once before and even called my tax attorney to confirm the IRS doesn't work like this. There have been numerous articles about these scams as the crooks running these scams have had some success getting folks to send them money by threatening some form of immediate action, but the IRS just doesn't work this way - and sadly a lot of taxpayers don't know this.
Got the same call from that number. I just hope it is a scam. They have a recording that says to return their call ASAP.I called them back from a private numbers and they never answer. Everyone be careful