Also received a telephone call from 509-790-0539 (Sunnyside, WA) on June 17, 2015. It was an automated message saying the IRS is initiating a lawsuit against us and to call them back. Of course, I immediately knew it was a scam but my husband freaked out a little bit.
My call came today from Grandview Washington, 509-203-4861 and they used a pre-recorded clear voice to leave a message indicating I am being sued by IRS. I called back and the guy said that his name was John Smith and it was concerning my taxes from 2008 and 2013. His accent was so sharp I asked him to slow-down so that I could maybe understand, he said let me get my supervisor and he came back on with the word "WHAT?" He gave me a case file number and I asked why I had not received anything in writing and he said that they could have an officer deliver it to me in 30 minutes. He kept repeating that the call was being recorded as if that would give the call validity. I hung up after letting them know that I was going to report them for this shameful scam.