very confusing (cheating)

I seem to come across more cheaters in the multiplayer then the free play . Why is that? I don't care what you say the mechanics of this game if you have a KD over 3 you are doing something ill legit I had a team mate KD was almost 5 his going right to hidden enemy and was running no recoil with aim bot  hitting people pretty much across the map with one shoot .I thought you can't kill anybody with one shot at a distance but I guess this guy can QC_Buddyy  is defiantly hacking 100% doing stuff with shots no one else can do. It is time to start calling these guys out maybe they will get the hint !