Refund Denied Without Explanation - Need Assistance from Apple Senior Support

You already have your decision and it's unlikely to be overturned. You subscribed. You did not cancel. You will be charged. I've not seen any successful refunds of subscriptions as subscriptions are essentially "consumed" for the subscription period. Be sure too cancel to avoid future billing, If you want to cancel a subscription from Apple - Apple Support

All transactions are final as noted in the Terms of Service. At times Apple may offer a compassionate refund, but there is no obligation to provide a reason for denial, as they should never be expected in the first place.

As noted when you signed up for the free trial, it shows the expiration date of the trial and also tells you that the trial must be cancelled at least 24 hours before the trial period ends to avoid charges. There is no requirement for Apple to further check with you as you have already agreed to those terms by double clicking the side button, followed by authorization with FaceID/Passcode.

As with any other subscription, it makes no difference if you use it or not after signing up. Take Netflix for example, you will be charged monthly whether you watch any of the shows or not. You will not get a refund because you did not watch anything, but you can cancel the subscription at any time.

Apple, could you please clarify:

Have you noticed yet you are not addressing Apple here but other end users? No one here can fix this.

Apple does not engage in discussions about policy here.

Just cancel all free trials at least 24 hours before the trial period ends and you won't have any problem. Some users set a Reminder to do that so they don't have to worry about remembering when it needs to be done. After you see the charge, it is too late, but you can cancel the subscription still to avoid any further charges.

I have seen no where that Apple has made a commitment to send a reminder to you before billing. You have already authorized the charge if it has not cancelled before the trial ends. All subscriptions automatically renew without a reminder asking you if you want to continue with the subscription. That is true for all subscription services I have, such as Netflix and HBO/Max.

Not sure about previous years' but that might signal a reason to not refund (excessive refunds). Consider it a life lesson.