People that study law?

If a guy said to another guy via msn and was buying something off a virtual goods website (not naming it) and said Im an ex moderator on this particular website and then when asked what is ur name on this website? they lied and said it's ***** when it's blatenly not? because there msn name isnt even the same as that? and then the other person says, I will p ur I.P onto higher authorites if u do not pay me �10 because I know that's not u because I have the real ***'''s msn...and then the guy that claimed to be this particular person said, I was lieing and I am not really him and said it quite clearly to the other person..but the other person kept saying pay me �10 etc...who would be in the wrong?