
It only costs around £17 to register a puppy.
There have been recent computer issues at the Kennel Club due to new computer system with hold ups since August, but most breeders will have had acknowledgement that their registration application has been received or even completed, but the delay is in getting the papereork sent out.
So the breeder can send you this as proof.
Sadly chances are your pup is unregisterable, and the breeder was counting on you not being worried about official paperwork once you bonded with your pup, and would give up on the papers.
The reasons could be any of the following:
The parents are not registered
The mother/Father does not belong to the breeder/stud owner (possibly even stolen)
One or both parents have breeding restrictions (progeny not elligible for registration) placed on their papers by their breeders.
The bitch was under a year, at mating or over 8 at whelping.
The bitch had already had 4 registered.litters.
The bitch had already had 2 previous litters by C.section.
These are all bad practices, and a reason to ensure any purebred puppy is at least registered.
Without registration you cannot confirm anything much about the ancestry.
I am not even going to comment on the ridiculously high price you have paid.
As in my breed £900 plus would be a normal price from a reputable breeder, though during Covid with having to pay for couriers to deliver pups during lockdown the highest price was £1400.
On this site you can search for your breed, and there is an average advertised puppy price year by year at the bottom of the page.