Why is iTunes charging my credit card
Why is Apple charging me for iTunes account I don’t use & wasn’t aware of
iPhone 8, iOS 13
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Assuming it’s real...
Subscriptions and Billing - Official Apple Support
See or cancel your subscriptions - Apple Support
Assuming it’s not, and is one of the zillions of phishing attempts:
Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support