Blocking words and chat, as Violetta suggested, is something that did come to my mind, however this is not a permanent or efficient solution to this problem.
It has its downsides such as, even tho you don’t see spam messages, other players do and boost spammers for example still stomp your “WTS [Actual Item]” message on trade channel, or your guild recruitment message.
Or your chat filter blocks a message that you might actually want to see. Filters are mechanical and not perfect.
Removing chat altogether is removing a very useful feature of the game, why not really solve the problem instead…