They might be on hiatus and haven't made that public. They may not be taking on any new clients at this time. Its possible you have been blacklisted but you wont be able to tell and not every women concerns herself with BLs unless its a serious infraction, especially if, you say, they are about cancelling appointments with due notice, unless you have more cancellations than you are letting on as then you would be viewed as a "time waster."
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Everyone experiences this from time to time so it may just be coincidental too. Reach out to another provider and see how that goes. You can pm me if you need more help. Good luck!

You might have bad reviews? That’s the only thing I can think of

I’m pretty well on top of my responses but sometimes thing slip through the cracks! Could be that a booking form isn’t working. I always say a nudge doesn’t hurt just in case they missed your inquiry!

Bro, this is not a big deal. There is more of them than there are of you. A lot more. When you start seeing more girls, you will realize certain things. Look it, you are not going to get every provider that you want but you will get enough of them and better. Once you figure it out, you will realize your real problem will be not having enough money or energy to keep up with all the hot providers to choose from. Use the non-responses and rejections as a weeding out process for you.  

...and have lives. "24-48 hours notice" isn't much notice, most of us wouldn't bother to respond to inquiries like this as it doesn't give the sense that you'd see us regularly. Generally people who become good friends are contacting us weeks or even months in advance, not reaching out last minute. Not worth most NYCers time x