This happened to me recently with verification to Coinbases's KYC system. I was repeatedly denied verification and after contacting their support on X (the only method of contacting support without logging in is social media) they gave me the same ring around that you've experienced. Ultimately I solved the issue by using my girlfriend's phone to take the pictures of my license.

The root of the issue in my case is probably caused by my camera's low quality pictures from a lack of AI post processing since I use Graphene OS. It sucks that you can no longer easily contact a human when you're really stuck.