An American concert promoter and his son learned the hard way that rappers are not the most scrupulous businessmen in the world.

According to TMZ.com, AllGood Entertainment CEO Patrick Allocco and his son are currently being held at gunpoint in an Angola hotel until rapper Nas and another rapper returns the $315K each that they were paid to perform a New Year’s Day concert.

Allocco’s people tell TMZ that Nas and opening act Jemiah Jai were paid $315k to perform 2 shows (Nas’ cash was wired to him in America) — but Nas failed to make his flight in the U.S., and apparently he didn’t reschedule the concert.

Naturally, the Angolan money man who ante’d up the cash for Nas’ concert fee assumed he was being screwed. So he sent his goons to fetch the promoter and his son and bring them to him — at gunpoint.

The promoter and his son were handed over to Angolan police and interrogated for 7 hours until the U.S. embassy stepped in to secure their release.

But they’re not quite free to go.

According to TMZ, the men are being held (likely at gunpoint) “in residence” at a local hotel while the two sides try to resolve the money situation.

Alloco’s people released this depressing message to Nas and his people:

“The hope is that Nas and Jemiah Jai will return all of the monies that were wired to them immediately so that our ransom may be paid and our safe return to the United States may be facilitated.”

Sadly, they’ll be waiting a long time if they expect Nas to return any of that money. We are taking about rappers here.