Me and my friend were playing in the Official Server server 4094SP First Person Only, and a Hacker just killed us, my friend was inside a house and i was outside, we were playing in a city that didnt had anyone at sight with a lot of zombies, then at the same time, i died and my friend didnt hear a shoot and he died also, from inside a house

i Have a video that proves this of instant replay

I need to know if theres someway that i can report this hacker, he ruined more than 3 days of gaming