I was banned for "killing a pug"

I joined this game (de_inferno) when it was 0-5 and helped the team start winning rounds. My teammates quit (2) leaving it as a 3 v 5. I waited a few min and noticed no one was coming and I was over the 3 v 5 rape. I quit thinking I would even do a favor to the other 2 teammates who quit. This PUG was about 2 hours ago. I think one of the other members who quit was CaliSnipe can't remember the other. Pretty annoyed over this. 

My steam name and in game name: chronicle
steam id: U:1:102261933