Called me on a saturday morning pretending to be the IRS.  After I told them I'd have to call them back, they told me the federal marshals were on their way to come and arrest me.  I laughed an hung up.  I called them back numerous times insisting to speak with a manager and they constantly hung up on me.  The last 2 times I called them, nobody answered the line.  JERKS!  THE IRS WILL NOT CALL YOU, don't give anyone your personal information over the phone no matter who they say they are!!!  Scammers take all forms.