My sites have been as well - pocketables and theitbaby.
22 year old site, 9 year old site. Attempts to get an answer were basically that they asked the techs to research it, they were not given an answer other than that something was wrong, they couldn't tell me what was wrong, wouldn't keep the case open, and I should completely redesign my sites and maybe in 2-3 months Bing would index them again.
Took weeks to get that wonderful bit of advice... two tickets I had opened, one for each site. One was abandoned by the people, the other that even though I'm not going against any of their webmaster guidelines that I needed to redo everything.
