Have to admit that due to logistical problems we bought a review product the other week from Currys using the reserve and collect service - we didn't pay upfront, but when we got to the store.
Didn't stop us going through 15 mins of:
Me That's the wrong one
Them No it isn't
Me Yes it is
Them Are you sure?
Me Yes i am
Them Well it's the only one we have so it must be the one you ordered
Me No it's wrong, can you check?
Them No it's the only one we have
Me Look it's really not the one I want
Them It's the only one we stock
Me Well it's not the one I ordered on the website - look, here's the model number on the confirmation I printed out and on the receipt you just gave me after you tried to sell me an extended warranty, please have another look
...Before I got the right product. Ridiculous thing is, the one they were trying to palm me off with was much more expensive than the one we'd ordered online, and I'd just paid for.