To reiterate what has been said previously, log into your Roku user account (https://my.roku.com). Once there, look under Subscriptions. If you are being billed by Roku for anything, it will be listed here. If there's nothing listed, then you are not being billed by Roku, regardless of what the charge says on your CC statement. If you are being billed for something, you can cancel it from that same web page.
But again, if there's nothing listed, they you are not being billed by Roku. Scammers can make their charge say whatever they want, so they're simply inserting the Roku name, hoping people see it and think it's a valid charge. If you have confirmed it's not something you did subscribe to, then you need to contact your CC company and contest the charge. This will force whomever is billing you to either provide proof they are authorized to bill you, or you can get your money refunded from the CC company.
Dan
Roku Community Streaming Expert
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