Please report bad user to the Customer Service 
  by following below steps. 
  Request for 1:1 inquiry.
  
  [Report Bad User]
  1. Save relevant screen capture image(s). 
  2. Go to 'Contact Us' in the setting option.
  3. Report with following details. 
  
  [Report Bad User]
  - Your Nickname:
  - Occurrence Date/Time:
  - Must include relevant screen capture image(s).