I recently changed my username on Opfactions to WubbacaFTW and my old username had 777 axes and I would like to transfer my mcmmo from wbcpvp_123 to WubbacaFTW. Here is my evidence.
Nothing much you can do, just wait 30 days and change your name back and your mcmmo stats will come back.
Just do as what Cryptic said if you want all your McMMO stats back, I'm sorry this happened to you. Resolved?