Rule number 2 literally says no whining or bitching on other players. Spawnkilling is indeed not allowed, but you can't go ahead and play judge yourself. We have admins to take care of this. Then there's rule number 11 that says if you disagree with how an admin is acting, send them a pm and don't go on in public chat. I presume you didn't follow that either. Also you're being kind of rude, which breaks rule 14 and possibly 16. You could've come here and discuss things as an adult. No need to come here in full attack mode.
Lastly there is no such rule as warning someone twice before kicking. Imagine if we'd do that, we would be warning players 24/7. Every situation is different. Our admins are perfectly capable of handling these situations. If they think that, for instance, a direct kick or ban is warranted, they are allowed to do so. If you disagree with the way you've been treated, come to the forum as a grown up and make a decent appeal. Since it was apparently only 15 minutes, I'd advise to sit it out, grab a drink and come back without making a scene. It only makes it worse for you.