How to talk to someone in billing.
I don’t know how come I keep getting charge for Apple Music because I don’t use it.
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To see what you've bought/subscribed to : See your purchase history in the App Store or iTunes Store - Apple Support and View, change, or cancel your subscriptions - Apple Support
If you want to talk to iTunes Support : http://www.apple.com/support/itunes/ww (click on your country's flag, the country where you live, and which is therefore the country on the account ; click on Contact Support towards the top right ; click on Get Help under 'Talk To Us’)