Billing issues

The charges can be for other iTunes purchases

Apple Music will say “Apple Music Membership”

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

Possibly this:

About payment card authorization holds from the App Store or iTunes Store - Apple Support

It will be undone or reversed once it clears.

By “ deduction” you mean what? it charged you?

You can  check your purchase history to see recent charges

The trial is for new users, did you have it before?

You can view it on the web.

See your purchase history in the App Store or iTunes Store

https://support.apple.com/en-ca/HT204088#web

“You can view your purchases from the last 90 days using a browser on any device. Go to reportaproblem.apple.com, then sign in with the Apple ID and password that you use for purchases in the App Store or iTunes Store. If you need help with a two-factor authentication code, learn what to do.”