Apple Music Subscription

Verify that the subscription bill is real.

• Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
• Identify legitimate emails from the App Store or iTunes Store - Apple Support

• Investigate charges that you see on your financial account. If you see 'apple.com/bill' or an unfamiliar charge on your statement - Apple Support
• See a specification of all charges to your Apple ID account, including subscription fees. See your purchase history for the App Store, iTunes Store, and more - Apple Support
• Manage your subscriptions. See or cancel your subscriptions - Apple Support

Did you initiate the free trial? After the trial ends it would begin charging, unless you cancel it. If you want to dispute this, contact Apple directly: Get Support