I think a lot of times we as consumers or "polite" individuals fail to claim what's ours. We think that by returning a flawed or broken item that we are somehow hurting someone or something. We say to our self, "I wonder what the store manager will say?" when returning a defective gadget. Listen people, if it's broken or flawed then it's just that .... BROKEN and FLAWED!
Now I understand that with wine it's a bit different. We sometimes don't trust our judgement or feel that the retailer will disagree and make us feel stupid. What I've come to realize it that who really cares what they do or say! They still need to get the bottle replaced for us or we will just take our wine business elsewhere and most likely never return.
This is a principle that us here on the west coast are still developing. Most of us were brought up being taught not to dispute things that seemed wrong or out of place. People back east in New York and so on, have absolutely no problem telling you how it is and how it's gonna be. They're not afraid to get their money's worth and most the time couldn't care less about what people say or think about it.
Moral of the story: If you have a corked-ass bottle of wine then return it pronto! Trust me, you won't be hurting anyone's feeling by proclaiming that the juice is hardly drinkable and it's not what you paid for. If they say anything to make you feel uncomfortable then just advise them that you will gladly take you lifetime wine business to another shop.