Having just come out the other end of the BaT process, yeah, it can test your patience. They have a Customer Service group that handles special cases, but that's not really your situation.
When I wrote up mine, I first looked at a few listing to see what their format was and made mine similar, being sure to use terms like "reported to be", "allegedly", and "said to be." I was initially a little offended that they use such statements, because to me it hints at dishonesty. It was explained that, no, they use it because they have to take your word for some things that they can't confirm. Okay...
We went back and forth a couple times and that was it, the high point being when I got to highlight their misspellings and grammar issues :).
Most people, including myself, get tired of arguing and eventually let it go as-is. Here's my best advice:
You can comment in your own auction and set the record straight on whatever they've distorted or gotten wrong.
Just be aware they're a business and want to maximize their chances of getting a commission. That more or less explains why they don't want to put up listings that are so badly written that they fail for that reason alone. As long as you look at them as a 100% money-making venture that just happens to handle cars, you won't go wrong. Oh, and fully expect to be ground down on whatever reserve price you come up with, because again, they want to maximize the chances of it selling. At least they didn't push me to have a No Reserve listing, that would have stung...
Oh, and as far as BaT alternatives go, I used a site called Race-cars.com to sell Kimini, and that worked out well. That said, it may not work well because most there are understandably looking for hardcore track cars, but I think there could still be interest in an S2000.
And after all this typing, no, sorry, I do not know of a Contact Management path to getting your situation resolved.