I signed up for inbox preview by accident and now it seems there is no way outside of contacting support to get this removed. This is a terrible way to add extra costs to my account without the ability to easily undo it.
Please remove this "feature" from my account immediately.
Thank you for reaching out to the Community! I apologize that you accidentally selected the Inbox Preview add-on. To get this removed, you will have to give our Billing department a call for security reasons. Please see the contact information here. Thanks!