This video says about itself:
Cameroon: Migrants tell of Libya’s slave market hell
23 November 2017
Translated from Dutch NOS TV, 30 November 2017:
Slave Adaman was cut with machete to extort his family
Adaman Ouattara has huge scars on his left upper leg. The Ivorian was cut by a Libyan slave owner with a machete, to blackmail his mother to free him.
Ouattara had her on the phone while the slave owner cut him with the machete. He screamed out loud. “My mother heard that, then the money comes quickly.” …
There he was bought and taken away by a trader. “We had to plant potatoes while we were constantly being held at gunpoint by a man with a kalashnikov gun.” After a month and a day he was released.