If in fact they are swindlers, I just lost some solaris, be careful, you should ban for life these scammers
Unfortunately, there is no way that they get banned.
Also the thread in the OP has already been taken off which is a huge worry. I really don't see koinbi.com coming back or becoming legitimate any time soon. Scammers will remain to be scammers, they never show any remorse.
The most common issue people seem to have with them is the withdrawals stuck at being "almost done".
Still, i'm not sure why anyone would even consider to use them. They don't offer anything that legit exchanges don't offer atm.