I'm really sorry you experienced this. It's not really acceptable from a T. Five or ten minutes is forgivable...but 30? It's not as if she can say she lost track of time. Even if she was dealing with a crisis situation it's not fair to leave you waiting for so long and especially not to ring or leave some sort of message afterwards. It's just really, really bad. I hope you feel satisifed enough with her explanation to trust her again.