I need a refund

For items listed in the purchase history of your Apple ID account, you can request a refund, which can be approved or denied, depending on circumstances and description. Request a refund for apps or content that you bought from Apple - Apple Support.

If the item that you seek a refund for is a subscription, then you should cancel it first.

If you see 'apple.com/bill' on your billing statement - Apple Support

View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support See your subscriptions overview - Apple

Subscriptions and billing - Official Apple Support