Had a similar but less dramatic experience happen this last December when I decided to trade in and purchase an iPhone 11. There was a dead pixel on the screen so I return + exchanged it, however Apple quoted me a different price after the exchange. No idea house this happened, but they still let it go through. What takes the cake is when the genius at the pickup line tried to give me two pairs of AirPods as I was leaving the store “you bought these right?” I had to respectfully decline the free AirPods and left wondering at the pre-Christmas chaos that was taking place.