Sorry to hear that you have been scammed by an explicitly named "unnamed" exchange. First thing that you must know before engaging/registering on an exchange platform is its reputation and eligibility. Some platforms are just made due to people wanting to earn with fees. Also, you must also consider the trust  history of the user who posted the thread you mentioned -- which could already support your claims that it is a scam. Furthermore, you must also have a better thread styling to have provide readers an easy read on what to support. Again, sorry to hear it mate, but I guess your holdings would be gone.