VAC banned means Valve’s system flagged your account as one with hacks on it. There’s nothing anyone here can do for you; even if you’ve nothing to do with hacks, the chances of you getting unbanned are pretty low. If you want to try anyway, you’ve got to take it up with Valve/Steam, because Facepunch has nothing to do with it.
Don’t mind the idiotically pretentious video Mio posted, and don’t bother posting your Steam account unless you want a sweaty horde of amateur internet detectives who don’t know the meaning of confirmation bias swarming the thread to make themselves feel good.
I warn you. It’s a trap.