Thanks for sharing this situation. I had considered ordering from Estes this coming spring, now I think I'll look elsewhere.
Even given that she ended up giving you a full refund, this all read like a really, really bad customer service experience. If you're in the business of selling chickens, then I think you should be knowledgeable about your product. I'd think even the most novice hatchery worker would be made aware that breeds like barred Rocks are sex linked, to make genders easily identifiable AT HATCH. I do realize that not all chicks conform to that the way they're supposed to and that mistakes are made (we're only human, after all) but those emails almost sound to me like they were attempting to brush you off and hoped you'd just go away.
Anyway, I've ordered from Ideal, McMurray and Cackle in the past and they not only sent me what I ordered (plus extras) but they were also kind enough to answer any questions I had and helped me identify which breeds were which even though I feel like they didn't have to.
Good luck.