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.
Recording said Julie Smith from IRS. I called back and a woman who claimed to be Julie Smith's supervisor repeated that she was with IRS and asked me if I had a lawyer and if I knew about the lawsuit against me. Of course, there is no suit I'm aware of. I asked for information and she asked for my Tax ID number (SSN). I told her I wasn't comfortable giving this out over the phone and she replied that she couldn't confirm who I was and therefore could not give me info.
I said I feel the same way about her, and asked her to send me a letter. She hung up. SCAM !!
Called back Indian accent man said he was IRS, there was a lawsuit against me and tried to get ss# I started prying and was told to just hang up and wait for the police ! Then he hung up on me !
I'm hiding under the bed now