Your issue has been escalated to the Comcast Team available to the Forums. A member of that team will reply to your post as quickly as they are able, so check back often.
In the meantime, please do not send a PM to an Official Employee unless requested because it is against the Forum Guidelines and the Acceptable Use Policy. You can read about our PM Policy here.
Welcome to the Xfinity Forum. I am happy to help you get your forum username changed. Feel free to post or private message me what you would like your new username to be. As long as your new chosen username does not violate our forum guidelines/acceptable use policy, we will happily make that change on your behalf.