I received the same call stating the exact same statement.
Very serious emergency and time sensitive we are calling you from investigation team of I.R.S. We have just received a notification regarding your tax filings from the headquarters which will get expired in the next 24 working hours and once it get expired after that you will be taken under custody by the local police as there are 4 serious allegations pressed on your name at this moment we would request you to get back to us so that we can discuss about this case before taking any legal action against you the number to reach us is 585-633-0784 I repeat 585-633-0784 thank you.
Called me and threaten if I didn't call them back, I'd be arrested. FU