Seattle
There are a lot of possible answers to this one.
I do not answer my phone while I am working, while I am in a situation where it would be inopportune (ie: on a date, at the dinner table with my family or friends, etc.) and the best idea is to just leave a message with a name and a telephone number or email address where you can be reached or, if you can not be reached by telephone for whatever reason, a time when you will be calling back. If, however, you call back several times in the course of a day/evening while I am unable to answer leaving meessages (or not, I have caller ID) I begin to worry that I may have someone obsessive or overly agressive on my hands.
If your phone messages or phone presence are threatening or agressive, I will not return your call and I will end the call if we are already speaking.
If you email me repeatedly in what I consider to be an unreasonable amount of time (I once had an impatient client email me 9 times in the same day asking why I hadn't returned his initial contact email yet. This is, obviously, an extreme case.) I will most likely choose not to see you. This is for multiple reasons, most notably that I am by this point irritated by you and I can't have a good time with anyone who I am mentally condemning to years of charm classes.
Finally, if you:
A) ask me either in person, via telephone or in an email to me about my services, I will not answer.
B) say something explicit to me via telephone or email, I will not respond. Not only is it unsafe, it is an indication that you see me as something less than a lady. 
If Ms. Foxx was unjustifiably rude to the potential client, then fine, she should be making amends. However, in light of his post and the mentions of repeated calls and uncomfortable questions as well as the agressive tone of his message I have to say that I probably would have abandoned manners in favor of expasperation as well.
No offense to the potential client in question, but when one is continuously on the telephone with people who could be a danger to your health and or freedom, one tends to be vigilant. You seem to have given off a lot of the warning signs of the kind of angry person one wouldn't want to be alone in a dark alley (or small room, for that matter) with. Hopefully it was just an off day.
Enough rambling, I think I'll retire The Escorting Miss Manners to her closet again. :p
Be well, play safe--
=jahnava=
MA--
I just wanted to clarify something. I have not accused you of being dangerous, I'm just trying to enlighten you to the fact that the behavior you exhibited (both what you have said you did in trying to contact her and your tone on this board) is the sort of thing that will make any provider who cares for her safety wary.
You may very well be a calm, genrous, warm person with the best of intentions, but when you do the things that I listed in my first post to this thread you will immediately seem agressive and threatening.
Better luck contacting the next gal, hopefully you (and she) will have an easier time of it.
xoxo,
=jahnava=