You wrote by snail mail and by email, which went unanswered. I don't know what is left beyond sending another letter(assuming the first might have been misplaced/misdelivered) or even "certified" mail--which of course would likely inflame the situation. But that would seem to be your last option, and there might be a tiny sliver of a chance that the previous mail was misplaced, not delivered, or something. If you get no response at that point, you certainly know the sensitivity to issues you discussed so maybe Kos is not for you. 
Ironically, Daily Kos has long been a refuge for DUers who were banned here for one reason or another over the past 2 plus decades. I don't know that they were more successful over there, but I did see some recognized screen names at one point some time ago.
Good luck!
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