Sorry to hear that. What commands did you use? My lvl 50 kai (lvl up legit) got banned and I never even used hacks on him once. But I think this is because they flagged my IP.
Nexon is really pissing me off. Instead of just banning my IP, they let me make new accts and lvl up and then they just ninja ban me even though I don't use hacks at all on the new accts.