Refund
How can I refund in this situation. I didn't mean to purchase this item.
iPhone 6s Plus, iOS 12
You need to cancel the subscription.
Managing auto-renewing subscriptions -
http://support.apple.com/kb/HT4098
Then ask for the refund.
iTunes Support form -
https://support.apple.com/en-euro/itunes-contact
ASC - Late 2012 Mac mini, macOS 10.15.3; Watch, series 5 GPS/cellular, watchOS 6.1.2; iPad Air 2, ipadOS 13.3.1; iPhone 8+, iOS 13.3; TV 4th Gen, tvOS 13.3.1; HomePods, audioOS 13.3.1 and Airport Express w/ Airplay 2