Foday Musa looked broken as he listened to the last voice message he received from his son.
It is 76 seconds long and the young man sounds desperate. He is crying, begging for his father's help.
"It's so hard to hear. Hearing his voice hurts me," Musa told BBC Africa Eye, which was given exclusive access to a police unit that helped him as he searched for two of his children who had fallen victim to scammers.
It was in February 2024 that Musa's 22-year-old son and 18-year-old daughter, along with five others, were recruited from their remote village in the Faranah region of central Guinea by agents promising them work abroad.
The jobs never materialised and the so-called recruiters turned out to be human traffickers. The group was taken across the border into Sierra Leone and held captive.
