This happened to me with my very first order from Bambino in 2010. Ordered a 2-diaper sample pack of medium Classico, received 2-diaper sample pack of medium Bianco. Emailed asking if anything could be done. They let me keep the Biancos and sent the Classicos free of charge in maybe around a week or so. I don't know if they'll handle it differently for you since you're ordering cases rather than samplers, though.