To cancel your membership you'll have do that either through the Google play store or via the App store.
To do this Via Google play
- On your Android phone or tablet, open the Google Play Store.
- Check if you’re signed in to the correct Google Account.
- Tap Menu Subscriptions.
- Select the subscription you want to cancel.
- Tap Cancel subscription.
- Follow the instructions.
You can cancel App store subscriptions, once logged in, here - https://support.apple.com/en-gb/HT202039