Hey JoufulKiller,
Our support team are unable to revoke or shorten temporary bans I'm afriad. It's unlikely the phrase you typed in chat would have been the cause, as bans are put in place for breaches in our code of conduct.
The length of ban you received will have been for multiple instances of a breach in our code of conduct, please bear in mind bans can be retroactive.
For your reference, please check our full code
here.
Thanks.