We're sorry to hear about the issue you're experiencing.
Please be advised that if you are removing a subscription channel billed to your Roku account, you must cancel the subscription first before you see the Remove channel option.
Moreover, if you need help with the charge, it may be more effective to get help from our Billing team. You can contact them here and then choose Accounts, payments & subscriptions. They are the best ones to help you out with that matter.
Let us know if you need more help!
All the best,
Roku Forum Moderator