Apple took my money
why did apple take money out of my account for a free trail
iPhone 11 Pro Max
Any free trial you start will eventually become a paid subscription.
You need to read the terms before you approve the purchase with Apple ID password or touch/face ID
if you don't want to be charged you need to stop the subscription at least 24h before the renewal date
How to cancel a subscription from Apple - Apple Support
You can request a refund by following the steps in this guide:
Request a refund for apps or content that you bought from Apple - Apple Support
You are not guaranteed a refund tough.
This is an automated process, if you wish to explain your situation in-depth to a person you can:
Contact Apple for support and service - Apple Support
Also, see this:
How long refunds from the App Store or other Apple services take - Apple Support
Good luck!