I waited till today, passed the 30 mythic days and the storage didn't update. After deleting a 50 gb backup I didn't regain my 50 gb storage. I got on an apple chat and had two advisors, highly incompetent plus one "senior" who kept asking to get access to my computer and that I had to update to Sonoma, that has nothing to do with iCloud storage .
I submitted my iCloud storage screenshot to them where it's easy to see there is a mistake but the advisors kept asking questions not relevant to the iCloud issue. So disappointing, so frustrating !
I told them the issue is on their servers , not on my computer.
BTW I checked the email they sent me and if I click on my case id I get that I have issues with my Studio Display !!?