To log a ticket click the support button at the top of this page.
You may be asked to log in depending on when you last logged on to the Nexon website.
On the next page, you should see a Log a Ticket button.
Click this and then fill in your ticket.
As for the MTS scam, it's when someone makes a name that exceeds the width of the table and overlays the price of the item so for instance an 11,000 item appears as 1,000.