If you have identified the subscription is from Google, please see the instruction below. If you have not identified where your subscription is from which platform, visit this page first: Identify The Platform Where You Subscribed
Submit a refund request to Google.
Go to play.google.com.
At the top right, click your Profile picture.
Click Payments & subscriptions and then Budget & order history.
For the order you want to return, click Report a problem.
Select the option that describes your situation.
Complete the form and note that you'd like a refund.
Click Submit.
Tips:
If you don't find the order, you may have bought it on a different Google Account. Find out how to switch accounts.
You’ll usually get a decision within one day but it can take up to four days.
To check if a purchase is eligible for a refund, learn about Google Play refund policies here: https://support.google.com/googleplay/answer/2479637
Google Terms & Sevices: https://play.google.com/intl/en-us_us/about/play-terms/index.html
To check the status of an existing refund, check your refund request status here: