お客さんの好みにあわないケース

Me: May I help you?
Customer: Do you have olive oil?  
Me: Yes we have. I'll go get for you right away.
Customer: Thanks.
Me: Here you are.
Customer: Oh, thank you. (Customer takes a sniff the olive oil in the bottle and quickly gives a scowl of disapproval.)
Me: Is there anything the matter?
Customer: Hmm, is this olive oil?
Me: Yes it's olive oil.
Customer: Nooooo it's not olive oil. Smells like vegetable oil.
Me: This morning I filled the bottle with fresh olive oil. I'm sure this is Australian extra virgin olive oil.
Customer: Are you serious?
Me: Yeah I'm serious.
Customer: Hmm, I don't think I want to have it. I think your restaurant should get a better brand of olive oil. This is not good quality.
Me: I'm sorry, that's all we have.
Customer: Sigh. That sucks.