If you really don't have a Roku account, then this most likely is a bogus charge placed by a scammer that has somehow gotten hold of your credit card number. When they place a bogus charge against you they can use any description they want, so they put in something innocuous like Roku, or Amazon, or whatever, in the hope that you will not look into it and just pay it.
I'd suggest you dispute this with your Credit Card company. You typically have something like 60 days in which to dispute the charge before it becomes unrecoverable. They can trace the charge back to whoever actually placed it. Once it is confirmed that your cc number has been compromised, they probably will have to cancel your card and issue you a new one.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
