Well, there is evidence against you, and all we have on your case is what you are telling us and your "brother", I'm guessing its just an alt. We have evidence that this highly accurate anti-cheat banned you and a pretty active member on the forums says you were using reach and fly. I won't disregard that no anti-cheats are perfect, but still, it's a small chance that it got it wrong. Just appeal and tell the truth and you can get it down to a 30-day ban. Also, the fact you came in here asking why it was a perm ban instead of asking just why in general is a bit suspicious as well. Normally, if you weren't hacking you would have no idea why you were banned. So the fact you come in and are like "oh, why was it a perm ban" adds some suspicion towards your story...