MrCraaap SCAMS BEWARE
Here proof.
Good job probably getting your account banned! I can see it now...
"Account banned for buying nx"
Mesos for nx items trades are against the tos. Not much can be done about your problem.
http://maplestory.nexon.net/WZ.ASPX?PART=/Support/UserAbuse/UserAbusePolicy
Reports do not belong on these forums.
Log a ticket with these images.