I've no idea how they could make a hash of it in this day and age, but a good few years ago a similar thing happened to me.
It was my first brand new car, I ordered a Fiesta with blue seats and was really looking forward to collecting it. Unfortunately upon arrival at the dealers it transpired the car had silver seats, which not only didn't look as good but they also showed dirt. They offered to 'find some blue seats from somewhere '. I told them 'no way are you stripping out my brand new car, reorder me the correct vehicle.'
They declined, so I rang another dealer that told me they couldn't get me a 1.25 in the correct trim, but there was a 1.4 showing on the computer that I could have for the same price.
'Done' i said.
As it was a Ford, the car was on my drive within a week. The original vehicle was left at the first dealer, complete with Sony Minidisc player that they bought in specially.