This isn’t the first phone call JoJo has made to social engineer someone and isn’t the first time he’s failed at it. JoJo sucks at social engineering and hacking -that’s why he spent a couple years in a federal penitentiary.
For some reason JoJo tries to disguise who he is by lowering his voice. Like most criminals he assumes everyone else is an idiot and won’t figure out what he’s up to. You can find more articles on JoJo, past and present at Bullyville