Roblox review: Unauthorized charges from kids

Yes 150 dollars was made from my paypal I did not authorize or approve this. Don't know how they had my paypal information linked to Roblox. 4 charges of 115 dollars. Now bank is negative and each charge that bounced extra 30 dollars. Roblox won't reply or answer. I don't think kids should be able to purchase like that. When I purchase 5 dollars for allowances for her then the bank ask me to verify everytime to sign in to bank and show the dollar amount. It did not do that she was able to log in use my PayPal which wasn't on file weird purchase 2 49.99 purchase and 10 and 5. I need that money back as a child shouldn't be able to make game purchases when under 18 .