Actually, from what I've seen, it looks like they get paid by how many customers they handle, which makes them try to blow you off as quickly as possible.
Maybe you got one who was trying to be helpful, but due to not really knowing much, ended up copying knowledge base articles that were irrelevant.
Anyway, when a chat ends, you get to rate it and offer feedback. I don't know how often anyone reads this feedback, but it's the only way I know of to send any.
(Or you can go on reddit and post screenshots of your chat. Seems they enjoy deriding clueless GMs over there. And who knows, maybe one of the mythical Nexon staff who browse the subreddit will take note.)