Just because your statement says Roku doesn’t mean it’s legitimate. Log into your Roku user account web page and look for any subscriptions. If there’s nothing there, you are being scammed. Your personal information has been stolen and thieves have submitted charges on your credit card and claim they are Roku. If this had happened, Roku themselves can’t help you.
If there are any subscriptions on your Roku user account, you can cancel them right there. Roku won’t refund legitimate subscriptions, but will cancel it when the current subscription expires.
Dan
Roku Community Streaming Expert
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