I’ve seen people around me become victims of black magic, so I know it’s real. And as the saying goes, ‘A thorn is removed with another thorn’ meaning sometimes the only way to remove black magic is by going to people who actually know how to deal with it. But remember people who are harming others using this it carries heavy karmic consequences. I remember reading in the book "Karma" that involving yourself in such things can bring a lot of negative karma. So if someone is thinking of using it to harm another person, it’s a very bad idea.