After an agreement between the majority of the Commanders and High Command, it has been decided that Units who are Amputated (This means killed by another Unit under legit reasons, not dieing in a fire-fight) are no longer allowed to make PK appeals. You had the warnings, which involves the Blackmark system, and if you get PKed from that system, you do not deserve a third chance to improve.
If you wish to get a Recruit back after your PK, speak with one of the Commanders.