General recommendations to the screenshot/video:
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Your proof should have: time in chat (hh, mm, ss); class colors; date on the calendar.
You should do Shift + Right click on the violator name to show additional information about the character (if fraction is friendly to you).
http://i.imgur.com/A8HIXYe.jpg
You should click on the player name to open window of typing private message for him.
http://i.imgur.com/JiD1Ymh.jpg
* If you aren't following this recommendations, moderator is allowed to reject the complaint or ask to provide a new screenshot.
Go decline this fake shit report already