How can I stop Roblox from charging my account?

Click on the link below, you can

• View your purchase history

• Cancel a subscription

• Request a refund

• Verify unfamiliar charges

• Add or remove a payment method

Subscriptions and Billing - Official Apple Support

Are you part of a Family Plan using Purchase Sharing that authorizes family members to make purchases to your payment method. If that is the case you need to either turn off Purchase Sharing or use Screen Time to prevent in-app purchases.

Use Screen Time to turn off in-app purchases on your iPhone or iPad - Apple Support

How to share apps and purchases with your family - Apple Support