Why am I being charged $17. For a $10. Subscription It’s been like this for a few months

You suggest this is for an Apple Music subscription, but Apple does not have an Apple Music subscription at that price point.

Manage your Apple Music subscription - Apple Support

You are indeed seeing this as a single item in your subscriptions?

View, change, or cancel your subscriptions - Apple Support

If you really think you are being over-billed for an item and this is truly and Apple Music subscription you are paying for at that price, contact Apple:

iTunes [Store] Support - Use this form for assistance with account and billing, code redemption, or purchase questions --> https://www.apple.com/emea/support/itunes/contact.html

Please review the below links:, the last one being the likeliest reason:

• You can review your purchase history and report problems with purchases  in the App Store or iTunes Store.
• Learn how to identify an unfamiliar App Store or iTunes Store charge.
• For help with recurring charges, you can view, change, or cancel your subscriptions