My mother was the one who explained to me that it was a scam, they have a very strong lip, they convince you that the thing they are talking about is really happening.
My luck is that even if she hadn't been there, I wouldn't have been able to do anything, I was a teenager of about 13 or 14 years old, with no money or anything, so I wouldn't have been able to pay for the cards, but I would definitely be terrified because I couldn't say if it's true or not.