You break the rules, you serve the time, I didn't set the ban for Blackdevil but I'm pretty sure that I agree with the choice from that admin. You can't expect to intentionally teamkill someone and get away with it, so many people have tried before and although I'm sure there are some that don't get reported, some that don't matter to the victim and some that aren't necessary of banning, most people get banned.
You two, unfortunately, are repeat offenders, there are several bans under both of your names for teamkilling among other things so you can't expect people to side with you. On top of that insulting people in an unban thread and then admitting that you would take revenge for an accident doesn't help your case in the slightest.
Run the course of your bans because they're justified and watch yourselves because I doubt the next punishment will be so kindly.