I've been getting an increasing number of private messages asking me to change User Names. This is something we don't actively support so I won't be honouring any further requests unless there is a very good reason for the update.
I dread to think how many other requests the Mods are getting if I'm getting almost one a day.
Finally, updating the case of your User Name is not a valid reason e.g. djusername to DJUserName