Unbanned.
Please try to be fair during trading, especially when dealing with new players. I am pretty sure you knew that 2 key fragments are worth more than 100k cash, so in the future try not to take advantage of players that might not know the prices.
I will be implementing notices and warnings into the trade window to warn players about fishy trades, but as long as this is not done, please try not to scam anybody that is new to the game.