The whole story: We have our main URL black listed by Facebook for almost half a year now. What can we do in order to get some reply from the support team ? W

The whole story: We have our main URL black listed by Facebook for almost half a year now. What can we do in order to get some reply from the support team ? We're a sitebuilder: http://www.cabanova.com http://www.cabanova.com. We give our users a free url: username.cabanova.com. One of our users got us black listed in Facebook about half a year ago. We acted very quick and disabled / removed the spammy user site. Nevertheless we noticed that we could not post anything with our url: http://www.cabanova.com http://www.cabanova.com in Facebook. We tried to contact Facebook support several times even sent an official letter, but we got NO reply. What can we do ? Facebook is really important to us. Please advise.