Not only did you do this, but there were allegations before your resignation/demotion of you abusing your powers to gain an RP advantage. You don't show any remorse or regret for what you did.
Not only do you do this, but you proceed to blame the admin and accuse him of being unprofesional. You know you broke the rule, and the fact you did it knowing you would get banned it worse enough, but to then complain about your ban length is a further example of why the ban length should remain.
A huge, monumental, gigantic