I believe I know what you're referring to.
Long story short, we made a deal on prices for different mini ranks. Before we made the trade, I said I wanted to keep 1 of them, but I would sell the others. He sent me the money anyways, saying I couldnt back out.
Then he got banned, and I contacted him telling him that I needed to give his BTC back. He essentially refused the refund, saying that I was obligated to give him that mini rank when he was unbanned. I contacted a few mods about it and tried to give them the BTC to hold until he got unbanned, with no luck. Don't remember what happened after. Didn't log into the website for some time after that, then recently just checked in.
I believe I have PMs in my inbox verifying this as well. I think JT and superman were the 2 mods that I contacted. Maybe frenzy too.
E