Called me on 5/14/15 from 512-595-0659 in Taylor, 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 against you. To get more information about this case file, please call immediately on our department number, 512-595-0659. I repeat, 512-595-0659. Thank you."
I did not call them back.