As a nine year veteran of UG, I hope the UG genie grants your wish. That said, here are some suggestions that you may not have undertaken already.
First, stop posting with that handle. Register for another handle. This might accomplish two things. One, it won't add to your posts under the handle you want to disappear. Two, if the registration process requires a confirmation email from UG (I don't remember the procedure), then it might give you an email address you can reply to about your problem.
Second, UG posts unfortunately will come up under internet searches. I did a dogpile search on your handle and 4 UG posts came up. Two of them were truncated, so they would not open on a link. But two did. And that would be enough for someone to discover you are a member here, if that is your concern. Maybe if a mod removed just the posts that are appearing, it would block any trace of your UG history. Alternately, you could try posting in other forums such that it would move any UG posts far back in the pages that come up under a search. It has been said that most people do not even go past the first page of an internet search.