Dog breeder blocking kennel club registration

Afternoon Beagles,

I have a dog-related question I would like to pre-legal advice on. I purchased a dog from a breeder back in 2016. He was sold as kennel club registered (which he was) but other than meeting him at the breeder's house we were not given any real information. He is perfectly healthy, and she is a very food breeder (he came from her personal bitch who is beautiful and very healthy!). In 2018 we purchased another Frenchie, a bitch this time, with the intention of letting them have a litter of puppies ourselves. Both dogs need to be KC registered in order to be able to register your litter as kennel club.

in 2019 they had a puppy who was very healthy and lovely, and we went to register him with the KC. When I got to the registration stage it appeared that the breeder had put a block on me being able to breed with the boy we bought from her. She never mentioned this in the meeting or in the advert.

I went to her as soon as i saw and requested she lift the block but she ignored this request. We let it go for a few months but the new owners have been chasing as they would like him to be registered so that they can get the benefits. I again chased her and she has come back to me with the following response;

"Hi, I’m sorry but this block was placed to stop any breeding happening as I wanted them to be pets only. I realise he is your baby and I know you only have his best interest at heart but the point is that going forward I can’t guarantee his offspring after much"

As much as I understand her (somewhat hypocritical) stance, I was not made aware of this at any point during the purchase, and this would have impacted our decision.

Having gone back and forth with her several times she appears unwilling to budge on this, and I feel my only obvious next step is to get a court to overturn her decision.

Any help, support or thoughts welcome!!!

Thank you

OJ