Cancel an App subscription

There are a couple of possibilities; first and most likely, a subscription runs to the end of the current period after it is canceled. The other is that the subscription is directly with the app provider and not with Apple. In that case the charge on your card would not say it was from Apple.

Note that if you report it to your credit card customer support Apple will cancel and lock your Apple ID for the iTunes & App Store.

The best course of action is to request a refund→Request a refund for apps or content that you bought from Apple - Apple Support, then contact iTunes & App Store support by using the link at the top of this page and navigating to the appropriate place in the menu.

See this Apple support link→How to cancel a subscription from Apple - Apple Support

When you say it isn’t an Apple app, is it listed in the Subscriptions list, and do the charges say “Apple.com/Bill"? If it is then Apple is collecting the payments as an agent of the app developer. If the app provider is billing you directly then you can safely request a chargeback.

Does the subscription appear on the list?