This just happen to me bought 12 eggs they sent 15 and 9 weren't even fertilized when I cracked them open at 7 days for candling clear the yolks were intacked and didn't have bad air cells I only got 2 chicks from the fifteen. I know how you feel it stinks and feel some people scam.
I'm sorry you had such a bad experience, but it doesn't really mean that you were scammed. Since at least some of the eggs you received were fertile it is more likely that instead of intentionally sending you eggs that couldn't have possibly been fertile (that would be indicated by all eggs being infertile), it is a matter of what can happen to anyone - even those hatching eggs from their own flock - in that, for one reason or another, some of the eggs laid/gathered for a particular batch just were not fertilized.