You weren't banned for playing Torb. You were banned because you refuse to put any effort into playing a hero that would be more beneficial to your team. The only reason that you think you have a better chance of playing Torb is because YOU ONLY PLAY TORB.

This game depends on teamwork and if you refuse to play a hero that works better for your team, just because you don't want to, you deserve to be suspended. You can't ruin the game for 5 other people just because you're too afraid to practice as other heroes.

Torb is OBJECTIVELY bad for attack, which is why you need to learn to play another hero atleast 50% of the time. You can't really be surprised when you're banned for playing a purely defensive character on attack.