is there any way to banned the user i file a ticket to steam support, and is there any way to get back my Keys, since i was scammed and moderator and developer can check trade history yes we know our fault is in ours, but there is no perfect we can do mistake sometimes that is why, there is a trade history and moderator and developer can get back the item if the issue was totally scammed, player got scammed was totally pissed off, We Create Dreams by playing this but if you will say you can never get back the item, what is the purpose of trade history if there is no investigation of the issue,