I've emailed these people twice now asking for a refund for COD as it's not playable and stated the appropriate laws. I've had no reply.
Steam has a refund button. I can find no such option on Blizzard's store.
Searching help for "refund" provides no articles aside from how to refund in-game items for in-game currency.
Just a warning that customer service is not on their priority list. Buyer beware.
I will be going to Paypal to get my money back if I don't hear from them within 7 days.