I would call them and tell them what happened, and offer to return it if they pay for shipping. I'm not gonna pay for their mistake, but informing them of their mistake is the right thing to do here.
Fermenting- EdWort's Haus Pale Ale
Bottled- Blue Star Wheat clone, EdWort's Haus Pale Ale, BIPA, Chocolate Espresso Stout, Black Hook Porter clone, Ginger Ale, Bee Cave Brewery Bavarian Hefeweizen, Peppercorn Rye Boch, Cream of Three Crops
Future- Old Rasputin Imperial Stout Clone