I wish to cancel Apple Music immediately as I do not use and have never used this service. There is a repeated charge of $9.99 monthly. How can I cancel this forever?

How to see or cancel subscriptions on your iPhone, iPad, or iPod touch

1. Open the Settings app. 
2. Tap your name. 
3. Tap Subscriptions.
4. 
5. 
   
6. Tap the subscription that you want to manage. Don't see the subscription that you're looking for?
7. Tap Cancel Subscription. (Or if you want to cancel Apple One but keep some subscriptions, tap Choose Individual Services.) If you don’t see Cancel, the subscription is already canceled and won't renew.

https://support.apple.com/en-us/HT202039