Almost got sued and reported to authorities (not really)

I had a guy call saying the balance on his account didnt make sense and when I told him he will only get payments until the end of December no matter the balance and he cant collect the left over he started yelling at me “WHAT DO YOU GUYS DO WITH THE MONEY? IM GOING TO FUCKING REPORT YOU! AND SUE YOU. AND PUT YOU ON THE NEWS. YOU PROBABLY STEAL THE MONEY! ITS MINE.” and I tell him no it goes back to the federal government he started yelling at me again. He wouldnt give it up and kept saying there has to be a way and that I probably steal the money lol. He seemed to seriously think we steal the money.