I sent back a bottle last week.
A Chilean Merlot that had corked and, probably, had not been well stored. No issue, but then I know the restaurant well.
I once was a customer of one of my suppliers in London and they left me chose the wine - without being wine-snobbnish, they knew I had a far better palate than they did - I can't remember what the wine was but I think it was a Fixin or similar, a Cotes de Nuits.
One and then two wine bottles went back - completement foutu. The waiter brought out a third and didnt even offer me the glass. The restaurant manager came out and we went through three more before he said that the whole consignment was evidently off.
A profuse apology, a very nice St Vivant came out for the same price! And plenty to talk about.....