Requested Name Change, Never Happened

So I have an e-mail stating my account name and display name had been changed as requested. But no, I am still the same throw-away username I had before MP was even a twinkle in EHG’s eye. I’d like it changed, but a ticket didn’t do the trick. For those of us who just randomly picked a username back in the early days, how do we change it now that MP is here???