Follow below steps to Cancel a subscription on the Google Play app :
Step 1 : Open the Google Play app
Step 2 : At the top right, tap the profile icon.
Step 3 : Tap Payments & subscriptions
Step 4 : Tap Subscriptions.
Step 5 : Select the subscription you want to cancel.
Step 6 : Tap Cancel subscription.
https://www.appypie.com/faqs/how-can-i-cancel-my-subscription
What happens after you cancel?
When you cancel a subscription, you’ll still be able to use your subscription for the time that you’ve already paid.
For example, if you buy a one-year subscription on 1 January for $160 and decide to cancel your subscription on 1 July:
Get a Refund on Subscription:
For information on subscription refunds, go to returns and refunds on Google Play or contact Appy Pie Support.