Request for Refund due to Unintentional Subscription Renewal

All you can do is try using the link provided:

Request a refund for apps or content that you bought from Apple - Apple Support

In most cases all transactions in the Apple Store are final. Sometimes Apple may offer a compassionate refund, but is should never be expected.

All free trials must be cancelled at least 24 hours before the trial period ends to avoid any further charges. When you signed up for the free trial, it shows on the screen the trial period along with the subscription price if the free trial is not cancelled. This is the way all Free Trials work. I suggest next time, setting a Reminder, so you will not forget to cancel.

Don't forget to cancel the subscription if you hav not done that:

View or cancel app subscriptions on iPhone - Apple Support

There is no such mechanism to contact support. Requested are made online at support.apple.com.billing or by following Request a refund for apps or content that you bought from Apple - Apple Support. If a decision was already made, there is little that you can do except to chalk it up to a life lesson.

You're not addressing Apple. While it's unlikely a subscription would be refunded you can visit support.apple.com/billing to review your purchases, subscriptions, and. billing details. Remember to cancel the subscription if you no longer wish to be charged in the future.

According to https://reportaproblem.apple.com/static/en-us/privacy.html , if you feel you want to discuss a refund request with a person, try to contact an Apple representative by email —> “If you disagree with your final decision, contact dpo@apple.com “