Step 1: Sign in to reportaproblem.apple.com
Step 2: Tap or click 'I'd like to,' then choose 'Request a refund'
Step 3: Choose the reason why you want a refund, then choose 'Next'
Step 4: Choose the app, subscription, or other item, then choose 'Submit'. If you were charged for a subscription that you no longer want, you can also cancel the subscription