Not supporting any side either, but those screenshots don't prove much. The first one is completely useless. The third one proves that he's received the items. The second one can mean anything, depending on the context, which isn't shown because you didn't take enough screenshots. So it's just your word against his.
Merceless's reaction is odd, though. A more natural one would be "I already paid you", not "grow up" or whatever.
But anyway, you aren't really doing yourself a favor by telling people to "stfu". That kind of language could get you banned as well.
Mabinogi: Nimfu [Ruairi]
Diablo III: Eire#2523
Current Game: Project DIVA ƒ (PS Vita)