Whoa!! Why should she have told him whether or not she banked at "his" bank? As she correctly pointed out, if she did, he'd know it. The records would be right there in front of his face.
She also didn't necessarily know whether or not her daughter banked there! Maybe she does, maybe she doesn't. In any case the guy was a telemarketer and he was "fishing". I'm glad she didn't take the bite and give him any additional information that he did not NEED to know.
White Dragon, I don't think you were rude at all! Rude might have involved slamming down the receiver or yelling at him for interrupting your favorite TV show.