As mentioned, go to the website and contact them about it. As for why you were klined, I don't know. You can be banned for a lot of different things. If you typed that into a channel, it may have appeared to be advertising and that may be why. That is a rather stupid reason to kline someone, but they're in charge and can do pretty much whatever they want.
Note that such bans typically last 24-48 hours and then you could get back on without trying to contact them.
