I think you should treat it as a learning/teaching example, and Wu-Tang Clan Ghostface Killah Method Man Book shirt. It’s never too soon to start establishing an idea of the value of money, and how banks and credit work. My son did this once. He had to pay us back either in chores or money he got from other things. And he doesn’t have access to my account anymore, now he has to get gift cards for stuff. Well if you don’t spank then your only other option is to talk to them and make them work it back with house chores. It happens. Remove the card info and talk to them about not spending money that isn’t theirs without asking.