Awww, I'm so sorry for all the losses, especially since you've been looking forward to having this breed for so long. That makes it all the more disappointing.
And I'm sorry you had such a bad experience with the phone operator at the hatchery. You were right to contact them, not expecting a refund at this time, but to alert them to your issues with your recent batch of this breed. If other customers were reporting similar problems, the hatchery might want to investigate their breeders. If everyone kept quiet, a problem that might be able to be resolved could just continue instead.
This operator could have been new on the job, and just reading from a list of required questions they're supposed to ask. Or they could have been on the job for years, and become jaded with other callers (NOT you) demanding refunds for things clearly their own fault.
Take some time for a few good cleansing breaths, some hot tea & some chocolates, and call them again, asking for a supervisor. At the very least, if it's true that SFs tend to be more delicate, they should know to advise others to give them extra TLC so they will be sure to thrive, perhaps not mix them with other breeds that are more pushy.
I hope your remaining chicks flourish!