They have completely stopped communicating.
It looks like this is really a theft of $11,000. Yeah)
Does anyone have the ability to find out information about the owner of the domain name of this exchanger?
Regret to hear they stopped communicating with you regarding this issue. On behalf of the Bitcointalk community, I and my other colleagues try our maximum to support you. Unfortunately we regret when we see their nonsense reply. We raised a red flag against that exchange and left negative feedback as well. It seems they aren't concerned about the forum's reputation; hence, they aren't complying with our community. Personally I am still trying to help you but am not sure it does work.