Dear Lucy
Having had a busy weekend, I am only just catching up with news from the Forum and have been so upset reading the threads and hearing your bad news. I am so sorry. I know that my words can't make you feel any better at this time but we are all thinking of you.
I do feel the advice given to speak to your breeder about a full refund is the right way forward and hope you may feel able to tackle this in the next few days.
I do hope that one day, you will be able to welcome a new puppy back into your home and enjoy a full life that poor little Toby wasn't able to have.
Much love to you and your family xxx