In my opinion, this case is dealt with by a criminal or a department of economic crimes. Have you tried to contact them? Or to the police station, I think they will give you directions.
There was a story on Habré, it read like an adventure novel. A person received a letter from Nigeria, psychologically entered into a dialogue competently and convinced them to translate for themselves first ... I don't remember, either $ 50, or $ 150. They translated. When they realized that they themselves had been deceived, they swore in powerlessness, of course!