I think you’re right - Curve’s promise of 1 working day refunds is only for unrecognized transactions.
But in my case, I recognize the transactions; the problem is non-delivery, so, as you say, the 1-day promise probably does not apply here.
I am still wondering what “delivery notices” I would need for non-delivered electric charging. As far as I know, there is no “delivery notice”, neither upon successful charging nor upon unsuccessful charging.
From the Curve customer protection document: “#### Goods or Services Not Received - check for delivery notices
This is when you haven’t received goods or services as promised by the merchant. Please check your delivery notice before contacting Curve as we will need it as evidence.”