Sandhill isn't for everyone. They're a family farm that does their best to maintain as many rare breeds as possible, making the basic genetics available for breeders to get their start, and breed up if possible. They don't claim to provide exhibition quality birds. They don't claim to have the customer service of a commercial hatchery. In fact, they very specifically state that they don't provide that level of customer service, and ask that you not order from them if those are your expectations. They very specifically state that they do their best to fill your order, but that chicks aren't always available to fill your order completely. Under those circumstances, they will send you whatever you indicate is the most important portion of your order, and then substitute whatever chicks they have available to fill out your order for safe shipping. If you have rigid requirements, you will probably never get any birds from a small facility like this. You'd be better off ordering from a large hatchery. True, most large hatcheries don't have the same breeds, but you can't have it all. There are large numbers of common birds available, and low numbers of rare birds. To expect there to be large numbers of rare breeds is unrealistic.
Here are my recommendations for ordering from Sandhill:
1) Decide on one breed that is the "reason for your order." They're not a large hatchery, so don't expect that you can order 2-5 chicks of 5-10 different breeds. Your order may be impossible to fill if you require such a specific mix, and you'll end up with a refund check in the fall instead of chicks in the spring. Tell them that you don't want them to substitute that specific breed, and to not send your order until that one breed is available. But allow them to substitute any of the other breeds on your order. That last part is essential.
2) Realize that just because you order 10 or 20 or 25 chicks of a specific breed doesn't mean that they'll have that many of the breed you want. When that's the case, they have to either delay your order until they have the full amount, or send you as many as they have and substitute the remainder of the order. Tell them what the minimum number of chicks from that one required breed is acceptable for them to send, and for them to delay the order until that minimum number is available.
3) Give them a long list of your preferred substitution breeds, in order of preference. Also send them a list of breeds that are not acceptable as substitutions.
4) Put yourself in their place, don't expect them to be able to read your mind, and be realistic. If you've ordered 20 Red Dorkings and they only had 12 chicks hatch, what do you want them to do? If you don't tell them, they'll do their best to fill your order by sending you the 12 RD chicks that they have, and substitute 8 chicks of a different breed. If they have 8 extra Blue Langshans that they send you, how are they supposed to know if you hate feather footed birds? Or Blue birds? Communicate and you're unlikely to be disappointed.