Missing Community Account

I'm posting this here because I don't know where else to post it.

The problem is that my Community account has disappeared. I hadn't logged in for a while but when I tried yesterday I got a screen asking me to provide a user id. When I tried my usual id - balrog - it was rejected as "already in use". I tried several times to log in using different browsers but got the same result each time. I then opened a webchat case with Support, but they couldn't suggest a solution.

Does anyone have a solution to this problem? As it stands I can't access my account to see if any messages have been left concerning previous posts.

I've had to create a dummy user - balrog2 - to ask for help from the Community.