Generation doesn't produce video, but consumes credits

I attempted to generate a video using Kling 3.0, 1080, widescreen, 10 seconds and it produced nothing, but deducted 250 credits each time. The screenshots show where it produced no video - it is a blank, black screen. 

How do I get my credits restored? 

The platform has been very unreliable - always seeming to lose connection or becoming unresponsive and I constantly have to reload.