How to stop hacker?

There's nothing that you personally can do to stop hackers, other than lending your helping hand to Overwatch, which is just a disguiesed way of Valve saying that they're too damn lazy to fix VAC. They want to leave it up to the players to fix their own community, and walk away with the money.
Hell -- We PAYED VALVE to DO THEIR WORK of cleaning the community.... It's like paying someone money just to do their chores.... wth?!

The only thing you cna do is help Overwatch and maybe you'll get some hackers banned... But as long as things are made by humans, they'll be broken by them. This is especially true when you're playing competitive games like CS:GO