I’ve never had a wrong charge on AT&T......however, I don’t make any overseas calls, either. My point about the lady paying the charges is that sophistication and technology pays a price. Those who use it blindly can end up surprised. It’s just like ignorance of the law, it’s no excuse for not even wondering (which I think she did because she’d cautioned her daughter and ‘agreed’ on usage) She just didn’t follow through.
Ignorance of supposed commercial agreements is not tantamount to ignorance of the law.