I had 3kg of plain yoghurt at Christmas... the 3 was actually supposed to be tins of beans. It wasn't a substitute, just an error. The same order delivered the three most expensive items short-dated. Not too short to eat but annoying for my meal-planning whilst we had visitors. They refunded these so that was good news in the end.
We are vegetarian and so some years ago we ordered Quorn "chicken style" to try. It was subbed with real chicken...
I was told by the "yogurt supermarket " that they had taken on lots of Christmas staff and they thought their "training was rushed".