IMO, if you can't even contact the real owner, then why the heck are you even trying to recover the accounts? Who are you trying to help here?
Learn to differentiate your real guildies with impostors, if you are really close friends, you should be able to tell if it is/isn't them right away. Sharing accounts is against the ToS, so therefore ijji is not liable to help you in any way at all. TFT didn't care, so they of course wouldn't delete your thread.