With all the recent improvements to our anti-cheat I would like to remind everyone how to properly report a player with Fairfight.
You press TAB (or the key you have bound to display server player list) and select the player you wish to report. Then click the report button, then press enter. Do not put a reason, do not type anything else, just click the report button and press enter. You only need to do it once, multiple reports on the same player will have no effect as your account ID can only submit a single report per unique player ID.
If you feel you have been cheated, use the Fairfight report function. If other players are seeing your report message in chat then it means you have done it incorrectly.
TLDR; A successful report will be invisible to other users.
LASTLY - It doesn't matter if you get reported 5000 times. An admin still has to investigate the report. No player is ever banned off of reports alone.