Automatic renewal

First thing you need to do is cancel the subscription. See this, View, change, or cancel your subscriptions - Apple Support

Then see this to request a refund. They are not guaranteed. Request a refund for apps or content that you bought from Apple - Apple Support They are reviewed on a case by case basis.

Once you download an app that has a subscription and you don't cancel the subscription before the free trial is over, you have subscribed to it.

Deleting the app does not cancel the subscription.

https://support.apple.com/en-us/HT202039#iOS

All sales are final per the terms of service for the appstore. You can request a refund but are not entitled to one.

https://support.apple.com/en-us/HT204084

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

See above link for info.....