The same thing happen to me. I was charged the full price for the NFL Network and it does not work. I can not watch the NFL Network and they will not refund my money. I'm going to my bank to get my money back and let the n=bank deal with Roku. Roku is only interested is getting money but not to help you when the channel does not work.
For account and billing related issues, please reach out to our support team directly here for your 'Account or billing' issue, here: https://support.roku.com/contactus. They will be able to further assist you.