I have had the same experience with SA's at Madison. The one I have worked with doesn't reply to voicemails or emails even though I have said if you have x in stock please let me know I will come in to buy (and I have bought). So annoying. I live near the Manhasset boutique, but as I find their stock hit or miss, I really have no choice but to shop Madison in spite of their rude and less than helpful attitude. I agree that you should speak to the SA in person but unless you get a recommendation here for a specific SA, you may end up with another SA who is just as bad. Good luck!
I disagree about Manhasset, there has been very little I have been unable to find there over the last 10 years. It may be "hit or miss" if you just walk in occasionally, but they do get good stocks, most especially on scarves and bracelets, and a good variety of bags, and if you let them know what you're looking for, their lovely SAs will call you when it arrives. Manhasset is always my first choice, and I go to Madison if I can't get it at Manhasset. If you're looking for something a bit unusual, like extensive RTW, jewelry or Men's, then of course Madison, but for most everyday H, Manhasset is fine. Also better for building SA relationships. And so easy to just pop in when you happen to be by there!!