Before you send that letter off, read this article from Wrightslaw. http://www.wrightslaw.com/advoc/articles/Letter_to_Stranger.html
When you're communicating with district people, it helps to be very careful of what you say. Using words like "slanderous" and "blatant unwillingness" may actually backfire on you - districts tend to be protective of their own, and you may end up putting them on the defensive against you, rather than bringing them over to your side. I would honestly consider your letter a first "get it off your chest" letter, and use the Wrightslaw guidelines to write a letter that will be more likely to get you what you want.
I know (from experience!) how frustrating this is. I know how badly you want to say these things. But I also want you to succeed, and I don't think this letter will help you do this.
If you want some help, feel free to email me at email@example.com
Amy & Emma (6 years old!)