TBH I think all of the seed suppliers make occasional mistakes and I couldn't recommend any of them as foolproof. I have, in the past, had squash seed from Premier seeds direct, that weren't the variety I ordered - all perfectly edible, but that isn't really the point is it?
All you can do is complain when it becomes obvious what has happened, if you can be bothered, usually it means you get a voucher towards next year's seeds.