Hi Lizzy,
I had this same issue last year with Garnet Oak Leaf and as Charles said if you bring the issue to the attention of the company they will give you replacements. Not much compensation for your time and expense but it is at least something.
Its the time that’s lost that is so maddening, 4wks before you realise something is definitely wrong with the seed, a week perhaps to get replacements and another 4 weeks to get to where you should have been with this batch of seedlings in the first instance. A full month or more lost.
Don.