I, too, have received to computer messages saying "arrest warrant," "legal action" against me--from this number. I presume it's some bogus scam. The IRS would never threaten with a phone call. They always write letters.
FUNNY they think the IRS calls people, no they do not. They also don't need to go through the police as they are above the law. Also if they did care to call you would definitely be speaking with an American not a computer. Just know they will find your guilty butts at work ;} jk.