Called me first on 11-13-14 from 512-453-9341 in Austin, TX and said "Hello, we have been trying to reach you. This call is officially the final notice from IRS, Internal Revenue Services. The reason of this call is to inform you that IRS is filing lawsuit agaisnt you. To get more information about this case file, please call immediatly on our department number, 202-821-4201. I repeat, 202-821-4201. Thank you."
I did not call them back.
They called me again the next day on 11-14-14 from a different number 607-397-8255 in NY and left the same message.