Last year I had really good germination rates with my seeds, and ended up planting 45 seedlings - all of which are still alive. (some barely because of the drought)
This year I started about the same number, and have a whopping 20 seedlings which just went into the garden.
Some were purchased seeds, some were collected.
Have no clue why the difference.
And no, I did not complain to the sellers of my purchased seeds. On the other hand, I refuse to pay more than $1 a seed. So I am not talking big bucks. So survive, some don't.
I do like Michelle's suggestion about offering to replace them if possible. But personally, I wouldn't complain, especially if they looked "good" upon receipt ~Jan