well bro, im sry for ur loss, but just to let ya know, if u dont have any convincent proff this post can be considered as spam, and be locked, but ofc if u have screen shots of the dialog, and a good case, u can report him on S/A forums, and u can get him banned not only on d2jsp, but also on 2moons u can get his account suspended, and even banned, it is against the rules, to scam another players, on both cases.
Best of luck. and hopefully u have ur chatlogs saved.