Denied, i dont see bias from cool3. Though, If you dont agree with his decision, you are free to ask them to post unban appeal.
Also make sure you are aware that the admins decision are not based on the report alone. If there are doubts, new player with new UID that joined and get reported for aimbot will more likely to get directly banned compared to old player that had played for years without any cheating record. The old player will likely get questioned and added to watchlist in this case. However, if the evidence is clear & the old player had record of similar rule break then he will likely get banned for longer time compared to new player.