Most (all?) subscriptions pre-pay for a defined subscription period and auto-renew when the subscription period expires. When you unsubscribe it stops the auto-renewal but the current subscription stays active until the prepaid subscription period runs out. Few, if any, will cancel immediately and refund the unused portion of your prepaid subscription.
This is all explained in the conditions you agreed to when you subscribed -- you know, all that stuff you agreed to without actually reading it.
Any subscriptions you've obtained through other services (Hulu, Prime Video, etc.) will have to be unsubscribed through those services.
Any subscriptions obtained directly from the channel will have to be unsubscribed on the channel's website.
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. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
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