I'm just going to throw this out here in case anyone didn't know that you can in fact change your battletag more than once.
This was my response:
Hey there,
I'm Game Master X, and I was able to take a look into your request. This isn't something that we normally do, but I understand that you were wanting a name that better reflected you, so I went ahead and made an exception to grant you one more rename which can be done through the Battle.net account management page.
Please choose a name carefully, as we won't be able to provide another name change after this.
This was my response:
Hey there,
I'm Game Master X, and I was able to take a look into your request. This isn't something that we normally do, but I understand that you were wanting a name that better reflected you, so I went ahead and made an exception to grant you one more rename which can be done through the Battle.net account management page.
Please choose a name carefully, as we won't be able to provide another name change after this.