Someone impersonate me , it's punishable or fair?

Like on tittle, i reserved some random ring in this thread :

http://forum.gamesymbol.com/f925/6-09-2015-bases-torchesm-anih-some-craft-534167/


after few days at least i catch mate who offer it, but he told me it's already sold to ME

like here :

View image: Screenshot054


fine or not? propably any rule dont tell anythin about it, market is free, but if some1 post Fast trade Price as Sur for this ring, and i "take it" , i think its not good mannered.