Cant change name from adventurer

Trying to buy something with battle.net balance and i have to put in my real name but it wont let me change it from adventurer. when i try to go to my account details and change it
just says error occurred

You may need to open a ticket with the Customer Support staff to resolve any account-level issues. They do not handle these on the forum for privacy reasons.

The same thing happened to me, is there a fix?