A man who became a woman is furious with her bank because the teller refused to give her account information over the telephone because of her deep, manly voice. Who's to blame?

The customer says the bank was horribly insensitive and discriminatory. She answered all the security questions correctly, but once the account was open on the teller's computer the worker said, "This account belongs to a woman." The customer said, "That's me, I'm a woman" in a deep, masculine voice. 

The teller said no information would be given over the phone under the circumstances.

Who was in the right? And what if the customer had been born a woman, but still had a really deep voice? That certainly happens. What do YOU think?