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Check out the v.270 Ride the Lightning patch notes
here!
A couple of hours ago I was banned for no reason, I do not know why because I do not use anything illegal. Although I never spent money on the game but spent a lot of time trying to improve my characters playing legally and learning how to do it. It is for this reason that I feel very angry and sad about what happened. I hope you can hear my complaint and please solve this problem

Sorry if my english is not so good
Comments
Or was your ban message on the world-selection screen in a blue message box?
The former message is not a ban, it's the automatic hack detection software activating because your client is desynced from the server. Log back in and you'll be fine.
The latter message is a ban, but we cannot help you with ban appeals on the forums. You should submit a ticket to Nexon here and then contact Live Chat during their ban appeal hours (you can find Live Chat hours here).