Did you ever have a Roku device that you returned, gave away, or sold? If so, there may be a Roku device out there that's still linked to your Roku account. Log into https://my.roku.com using the email address that's displayed on your Roku device under Settings->System->About and look at the linked devices. If there's any you don't recognize, remove them from your account.
While you're logged into your account, do the subscriptions show up there? If not, there's also the possibility that you have more than one Roku account and there's device(s) out there linked to a different one of your accounts with your credit card attached. Finally, there's always the possibility that they're fraudulent charges from scammers using Roku's name.
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