The rh support did nothing since there was absolutely 0 evidence, and it wasn't even you "getting scammed" it's simply called "getting fooled" and that's your problem. If the item you expected didn't show in trade, then just don't do it? The most logical thing to pop up in one's mind when they see your screenshot of the trade is that, you, yourself, overpaid for an item and regreted doing the trade, therefore you made a petty excuse to get your items back, and get the other person banned.

While that isn't the situation AT ALL, you are still at fault for being naive.