[Gryphus One]

Hello, my server has some cheaters but I don't know the best way to ban them. By default, sa-mp allows you to ban ip's and ip ranges, however I have noticed that some people's ip addresses change completely from time to time (even the first numbers), so even a range ban can easily be evaded. I could create a piece of script to ban their nicknames but they could easily change them too. I use both Slice's GeoIP and Incognito's DNS plugin to tell each player's country and dns, but only these 2 things aren't enough to be unique to each player and also some cheaters use proxies, which makes both their apparent country and dns be different each time. Finally, I have read about a function to get a certain id of each player (I can't give further details, but I guess some of you know what I'm talking about), but once again that id is not unique and banning it would affect other innocent players. Therefore, I don't know what to do to keep certain players out of my server.
Any advice?