I just tried to go into the server after a reboot and I was confronted with a screen which said I had been banned for repeated violation of the chat system.
I'd like to know what specifically I was banned for, and for how long?

use the correct format

"Repeated violation of the chat system" or if your brain can't intercept a simple sentence, it can also be said in two words "Chat Violations".

If you can't understand that then you don't deserve to be unbanned.