I opted for a 7 day free trial of the photo sharing app SCRL. My bank saying £34.99 was taken out! It’s only day 5 of 7 day trial. This happened to me last year. All I wanted was a Free trial

If you are talking about this app, see: Trial and subscription terms:

Start SCRL Premium with a free 7-day trial. Once the trial is over, you’ll be charged an annual subscription fee. SCRL Premium will automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. You can go to your Settings > iTunes Account & App Store > Apple ID > Subscriptions to manage your subscription and turn auto-renew off. Your iTunes Account will be charged when the purchase is confirmed.

This happened to me last year.

You are now much too late for a refund.

All I wanted was a Free trial

If an app has a subscription associated with it, see -> Delete apps on your iPhone, iPad, and iPod touch -> Delete apps on your iPhone, iPad, and iPod touch - Apple Support

• If you delete an app, it doesn’t cancel in-app subscriptions that you might have. While deleting an app, you might see a Cancel Subscriptions option. Learn how to cancel your subscriptions.

If you don't want to continue a subscription you need always to cancel that subscription in time, see the following Apple articles:

If you want to cancel a subscription from Apple

If you want to cancel a subscription from Apple - Apple Support

If the subscription that you want to cancel is not listed

If the subscription that you want to cancel is not listed – Apple Support (UK)

Hello _Help_with_SCRL,

Thanks for using Apple Support Communities. If you'd like to request a refund, you can do that from your device using the guidance from Request a refund for apps or content that you bought from Apple - Apple Support.

For billing help and questions, it would be best to reach out to Apple Support directly.

All the best.