I have looked at your ticket, and it appears that the issue is outside of the access level I as an account manager have, I have moved the ticket to administration department.
The thing is that I can not add the domain, system says it is already owned, no doubt a result from a system error when you removed the domain from your parked domains. That is usually a quick fix by removing the entry from the name servers, however in your case there's no entry on the name servers to remove.
You should get an e-mail when there's an reply, with the reply in it. If you simply replies to that e-mail your answer will be appended to the ticket.