Hi Shannon,
I am John J.D., a fellow Microsoft user like you.
I understand your concern. To address this, you can start by checking if your son's Mojang account has been migrated to a Microsoft account. You can do this by entering his email or username on the Mojang Account Migration page. If the account has been migrated, you'll see a message confirming it. If not, you'll get a prompt to start the migration process. You can find this at: https://www.minecraft.net/en-us/login
If the charges are linked to your Microsoft account, you can log in to the Microsoft Account website with your email and password. Look for the Services & subscriptions section to locate Minecraft under your active subscriptions.
You can use this link: https://account.microsoft.com/services
Click on Manage and then Cancel subscription to stop the recurring payments.
For Billing Help: "Payment, billing, and the Microsoft Store app help" https://support.microsoft.com/en-us/account-bil...
If issue persists please contact Microsoft support for further assistance. Here is the link: https://support.microsoft.com/en-us/home/contact
> Type a keyword and press Enter.
> Then click "Contact Support"
Note: This is a public user-to-user community forum. None of us here work for Microsoft and it is beyond our capability to assist directly with the account or login-related issues.
Best regards,
John J.D.