Care to explain how a response from Blizzard 21 hours ago is old? Perhaps I’ll just link you directly to Kaivax’s post, https://us.forums.blizzard.com/en/wow/t/great-vault-bugged/773356/3?u=narosd-dalaran.
What else are they suppose to be responding to? They identified the issue was a UI bug, nothing more. I don’t understand what it is you don’t grok here and why you think there is more to be done wrt the Vault.