I want to cancel a subscription
By mistake I bought a subscription but I need to cancel it
iPhone 12 Pro Max
You can view and cancel your subscription following the steps at How to cancel a subscription from Apple – Apple Support.
You could potentially try and claim a refund by contacting Apple's Form > Request a refund for apps or content that you bought from Apple – Apple Support however this isn't guaranteed and it is up to whether Apple allow the refund or not.