How do I unsubscribe and not get charged by apple

See if it's in your iTunes purchase history:

See your purchase history in the App Store or iTunes Store - Apple Support

Then, if it is, you can edit your subscriptions here:

View, change, or cancel your subscriptions - Apple Support

After you've edited the subscription, if you really feel like it, you can report a purchasing problem to Apple:

Get help with an item purchased from the App Store, iTunes Store, or iBooks Store - Apple Support

If it is NOT in your purchase history, it probably was an email notification and it's probably a phishing attempt. See this article: Phishing & Other Suspicious Emails

You're trying to cancel a subscription right...

When you go to Settings > [your name] > iTunes & App Store, Tap your Apple ID at the top of the screen>

Tap View Apple ID. (You might need to authenticate your Apple ID)

Then tap subscriptions... do you not see the subscription you are trying to cancel?

If not check here...https://support.apple.com/en-us/ht202039#third_party

Check your bank statement... if your being billed by someone other than Apple... try here, Get help with subscriptions not billed through Apple - Apple Support

Chances are very good that your subscription is not billed through Apple at all (which is why you wouldn't see the subscription in your subscriptions menu). See this article for help with subscriptions that don't use Apple billing: Get help with subscriptions not billed through Apple - Apple Support

View, change, or cancel your subscriptions - Apple Support