If you subscribe using Google Play Billing payment method, please follow the below steps:
Cancel a subscription on play.google.com
Go to play.google.com.
Check if you’re signed in to the correct Google Account.
At the left, click My subscriptions.
Select the subscription that you want to cancel.
Click Manage > Cancel subscription.
Within the confirmation pop-up, click Yes.
Cancel a subscription on the Google Play app
Open the Google Play app.
At the top right, tap the profile icon.
Tap Payments and subscriptions > Subscriptions.
Select the subscription that you want to cancel.
Tap Cancel subscription.
Follow the instructions.
Important: When you uninstall the app, your subscription won't cancel.