I understand its frustrating but we do need video evidence to ban someone. 1 minute before and upto the incident. This is because it is easy to troll someone into team killing you and then taking a screenshot to get them banned and troll even more. (Not saying this is what happened in this incident/instant) @Jaime
This does show that you team killed. Consider yourself lucky that he does not have a video of this. Yes arma can happen and the colour/team tags do not show sometimes but that is not always an excuse. By the sounds of it, you were trolling in the spawn area and firing in the spawn area. Consider yourself on a watchlist. Read the rules and follow them.