Thanks for keeping in touch and providing the additional information.
Please be noted that subscriptions purchased/billed directly from a service provider or otherwise purchased outside the Channel Store or The Roku Channel will not appear on the Manage subscriptions page.
In this case, it may be more effective for you to get help from our billing team to assist you further and ask for additional information to check the charge. 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.