Your Premium Pass is directly linked to the account you use in Apple’s App Store or Google’s Play Store and not to the game itself. This means that we (the Zookeepers) are unable to cancel it remotely.
So, in order to cancel your subscription, you must access your account (either on Google or Apple Stores) and terminate your membership.
When you acquire a Premium Pass subscription or a free trial, a pop-up message is displayed by the respective store informing the current value and stating that the subscription will be automatically renewed after that period, even if the app is deleted. iOS and Android devices work in different platforms, so there are specific steps for each type of subscription.
The cancellation of the subscription must be done directly on your device's settings through steps below, according to the platform:
On your iPhone, or iPad, Go to Settings > [your name] > iTunes & App Store.
Tap your Apple ID at the top of the screen, then tap View Apple ID. You might need to sign in with your Apple ID.
Scroll to Subscriptions, then tap it.
Tap the subscription that you want to manage.
If you're being charged for a subscription, but you don't see it in your list of subscriptions, you may be logged in with a different Apple ID.
Use the options to manage your subscription. You can choose a different subscription offering, or tap Cancel Subscription to stop the renewal. If you cancel, keep in mind you'll keep on receiving its perks until the end of the current billing cycle.
On your Android phone or tablet, open the Google Play Store.
Tap Menu (left upper corner) and check if you’re signed in to the correct Google Account.
Tap on Subscriptions.
Select the subscription you want to cancel.
Tap Cancel subscription.
If you also want a refund, you can check on how to request it on the article here.