Some days ago I created a subdomain and then I deleted it. Now when I try to create it again I get this error: Can't add domain: already in our DNS system.I don't know what can I do. Wait? I'm waiting for refresh of DNS for two or three weeks and the message appears again. Any idea? Thanks.
Sometimes, it seems, that they get "stuck" - I suggest generating a support request and ask them to straighten it out for you.