Red Flags
#1 - Calling about a "federal investigation".
#2 - Never asked for my name. Simply referred to me as "Sir".
#2 - Refused to give name of business.
#3 - Requested verification of social security number. Claimed to have last four digits, but refused to say them.
#4 - Threatened jail time.
#5 - Called me on my unregistered cell phone which is provided by my place of business.
Go back to the drawing board scammer. You are busted.