I get calls from these morons almost daily. It is a robo call recording saying the IRS is gonna suit me. Bla, Bla. Bla. Obviously a scam. IRS doesn't do this via calls, nor leaves messages on phone (robo calls), nor doesn't send emails. I heard that if they plan to suit you they send certified letters.
Someone with a deep Indian accent who has trouble speaking english answers the phone claiming they are IRS. I asked them for employee ID and badge number and they immediately hang up.
got 2 calls 206-317-1279 and 312-262-0496 claiming to be IRS, I did not answer but next time they will get some nice words from me thanks to all for comments