I post this because I want the cheaters banned, not chased off for a little while.
If you suspect a guy of cheating you should, before calling him a cheater, spectate him and see if he is in fact cheating. If it is obvious that the player is cheating then you shouldn't call him a cheater, for it will alert him and give him warning to log off, change his name, and go else where. Instead, you should try to contact an server admin, or someone who can contact an server admin. That way the server admin can see for his or her self and ban the player.
Also, don't ever whine to him, because he will most likely be amused at the fact that your mad, and as long as he is amused he will stick around. If you do feel the need to call him a hacker, and he doesn't respond, don't bug every one else by spamming that he is a hacker, for it will get you now where.
If the guy changes his name frequently you can type /players in the console and get his player ID, which you can then type /follow x in console to follow that player by his number.
If you play on the same clan server frequently, then get to know the clan members and their admins. For knowing them will help you prove your case that the player is a cheater. If you don't know the clan members well, then chances are the clan members will think your just a kid who whines because he or she is getting owned. Furthermore, there is almost always some one on the server who knows the server owners rather well, and might have them on their X-fires. These are the guys who can insure that the player gets banned, so that you never have to deal with him again.
Remember, people who hack don't care what you think, so don't get upset over it or try to entice them. Because they know they are cheating, and they clearly don't care, so calling them a cheater will only make them feel amused, indifferent, or alert, all of which help you none. So do the right thing, and do what you can to get him banned, not chase him off for a few hours.
No Dragon, red is my new color.
I once spelt violet voilate, I will carry that cross to my grave.
Dragonathan, no I can't.