iCloud big gray storage after deleting iPhone backup

First, I turned my iPhone backup on accidentally, it has backed up about 12 GB to my iCloud, then I deleted it. My backup in manage storage is 0, but then there is a big gray other files in my iCloud storage. I’ve called apple support 2 times already, and they said that it’s my “recently deleted” backup that I cannot delete and I have to wait for 30 days (I need it right now). Is there any way to delete that recently deleted files?