Hackers on console

Hello I got question. Today I was on nwaf on official server and I seen 2 people in control tower so i rushed them with m4 and shot each one like 20 times and they laughed to mic and broke my legs with mosin... And after that they invited me to patry where they showed that they are invisible, floating in sky, seeing through walls, instant headshot players and some more things... HOW IS THIS POSSIBLE?!