Roku charged me $10.99 today through my bank for Showtime Digi, never signed up for that and can’t find a number to call. Ready to buy a Firestick and drop Roku!
Check your subscriptions at https://my.roku.com/account/subscriptions and your purchases at https://my.roku.com/account/purchases . If none are shown there then there's a good chance it isn't from Roku, but you can try Roku billing support at (816) 272-8106. They won't be any help if it's just someone using their name. That would be up to your financial institution to figure out.