Banned for leaving finished game

[Airee]

I left a game after it finished and it banned me for 20 minutes. Wat.
Match ID 7659882

 

[ferreirajason65]

Just happend to me aswell, whats going on?

 

[Airee]

I just got banned again after leaving game that wouldn't start due to 4 different people spam-pausing. It hadn't progressed past "game starting."