How to make sure that subscription to Premium Account in an iOS application is canceled?
To make sure that the subscription has been successfully canceled please do the following:
Open the Settings app on the iPhone > tap your name > tap Subscriptions > select the required app > View subscription status.
If there is the Cancel Subscription button, that means the subscription is active. If not, that means the subscription auto-renewal has already been canceled. The renewal date or expiration date will be shown.