Please beware of this number.  Supposedly, it is the IRS criminal department calling where they will provide you with a badge number and case number where you have to pay a fee for tax fraud.  This is completely false, do not pay it, call your local sheriff department and report them, like the fraud they are.  They will inform you that the sheriff department will come to your house and serve you with the documents and arrest you for the fraud you have committed.  This is the scare tactic they used so you could pay them immediately, don't buy into it.  The local sheriff department does not get involve with this matter.  The IRS have their own policing force which is part of the treasury department.  Besides, the IRS will make numerous attempts via certified mail to make sure you have received the documents before calling.  I am hoping this note will help someone.