The fact that it's NOT a criminal offense at all and this is a scammer trying to scare you into paying? Anything to do with the Treasury or IRS is CIVIL, not CRIMINAL
I have received at least 10 calls from this number - they never say exactly who they are just that I am being charged with a federal offense and need to contact them immediately - since I go nowhere but work & home I can't imagine either of these places to be a federal offense - they must think Americans are morons! Reported this to the IRS
For the second day in a row I have received a call from this number. A recording says "I'm sorry, but that is not a valid extension". It comes from Ennis, Texas.