I had a similar experience when opening a bottle of Champagne for the birthday of an elderly neighbour.Bought for my son's 18th and was shockingly corked, but that didn't seem to stop him and his mates knocking it back pronto!
By the time I realised it was badly corked the rest of the room was necking it, toasting, and making appreciative noises. I decided not to spoil the moment, but found I needed to do something in the kitchen urgently - nobody noticed I returned with an empty glass.
Can't remember whether I claimed a refund for that or not. Strictly speaking, you could argue it was "fit for purpose"