Similar experience as others here. 360-807-5520 left a message saying the IRS was filing a law suit against "You".
For those who don't know, the IRS would never leave a blind message like this. SCAM! SCAM! SCAM!
Caller left auto message saying the IRS was taking a law suit against me and to call back ASAP. I went on the Treasurer Inspector General for Tax Administration website and filed an official complaint against this number. 4/7/15 at 4.02 pm
I too have received a call today from automated system that came up on caller ID as unidentified and asked me to call 360-807-5520 that it was my last notice that the IRS is suing me and that I need to call this number. I reported it as scam since this has happened to more than one person.