We appreciate you reaching out to us.
For these issues, it may be more effective for you to get help from our billing team. Please contact them directly at https://support.roku.com/contactus. Choose the option from the drop-down menu for "Questions about my account or billing," and you'll be able to send an email request there.
We would highly recommend creating a Roku PIN for your account to avoid any further unwanted purchases on your Roku account in the future. For more information about using a Roku PIN, visit our Support page here: How do I create or update the PIN for my Roku account?