If you subscribed to Premium through the App Store, the cancellation of the subscription must be done through your App Store account.
- Open the Settings app;
- Tap your name;
- Tap Subscriptions;
- Tap the subscription;
- Tap Cancel Subscription. You might need to scroll down to find the Cancel Subscription button. If there is no Cancel button or you see an expiration message in red text, the subscription is already canceled.
It's important to remember that deleting your account or removing Astrolink from your list of applications will not cancel your subscription.
Cancellation prevents renewal and any new charges. It's necessary to perform the cancellation in the store to avoid future charges!