I don't understand why I got banned...
Any admin please tell me why I got banned?

Go to their forum or something and write that question there.

This is the official community of crysis. They only can help if you will be banned from all servers(https://secure.gamesas.com/forums/viewtopic.php?f=40&t=24426). And of course they can only help about that if you don't used cheats.

Don't fret grasshopper. There are dozens of servers in the community waiting to include you. Unfortunately, they are in Asia and Europe. ...Ping