In the mining world, IhsanCakep advertised that they were selling an Extreme Sword for 20000. I said I would so they pm'ed me and I went to the animal farm where they were. We had an argument over whether I would pay first or they would give me the sword first. Eventually I paid them and followed them to the trading post in the spawn world. When I got the sword, it was just a weakly enchanted diamond sword that was named Extreme Sword.
I don't have exact coordinates, but I have screenshots of most of our conversation and the general area where these events took place. Personally, I would like this person banned.