I am having the exact same issue!! I have tried to get in contact with customer support with no luck. I have cancelled every subscription I have on my roku and have even removed my payment methods in a round about way because it doesn’t let you completely remove a payment method. Anyways, I have been charged between $7 and $9 from Roku 4 different times within the past month but I have no subscriptions. What the heck is going on??? It’s definitely fishy.