Your money has been refunded. Next time you might want do more research. The feathering issue with Icelandics has been under discussion for years, not just on BYC and my website, but Facebook and Yahoo groups as well.
Regarding your only hatching six chicks, I have not had an infertile egg in over a year. Perhaps the package received rough handling by the post office or there was a problem with incubation. In either event, if you were unhappy the polite thing to do would have been to contact me via PM and let me know.
Enjoy your Icelandics. They are wonderful birds.
Mary