Since it is probably a prepaid phone, I'm willing to bet that the scammer has a new number & the old number was passed on to someone else by now who is completely innocent of whatever happened. That someone else is going to probably complain to the police and this guy is going to get in serious trouble for harassment.
I can't help but notice how the guy mentions the person on the other line was confused.
When I got a prepaid phone a few years ago, I got constant calls, even in the middle of the night because whoever had the number previously posted it on their Facebook, invited any random person to call him anytime, and then never changed it when he got rid of the number.