For all you know the 3rd on your team lagged out and wasnt his fault, power cut, emergency phone call and had to dash, anything could have happened. You actively made a choice to abandon the other guy on your team and left him in a 1v3, so you deserve your suspension for being a coward and a deserter. As for matching the same team, it happens. Comp is sbmm so its gonna find you matches against similar skilled players. If both teams finish the game at the same time, which they would, and both start searching for the next game at the same time then it makes sense that they'd get matched together. If you wanna avoid it then wait like 30 seconds before searching for your next game.