I received a call also, telling me to call 360-663-4445.  I did call and they were telling me the IRS had a lawsuit against me and that federal agents came to my door to have me sign for a notice and nobody was here.  Telling me  that I owed thousands of dollars and that they were gonna revoke my license.  I was gettting very upset.  But I don't stay calm when involving money and no notice through mail.   I also kept telling them to give me someone who spoke English, went through three people with broken English.  Finally got really peaved and said I was calling a lawyer and my accountant.  I was happy to see this site.  Made me feel better that I don't owe thousands of dollars.  I looked up phone number and as far as I got with the # above was, its a landline in Seattle, WA.