Not long ago I ordered a lovely scarf - not cheap - online
It was wrapped in that thin plastic, and evidently the plastic had stuck together, plus whoever picked it up was in a hurry, since 3 arrived! (still vaguely stuck together).
I wondered at first whether it was my mistake, but no, the order form said just one.
So I sent the other 2 back (freepost) only I forgot to include the form to say why you're returning the items.
Once I'd realised (found the form among the mass/mess of papers on my 'desk', i.e. dining room table) I phoned the co. to explain. However they'd already 'refunded' me for the two I hadn't paid for! I suggested a de-refund but they said no, evidently too much faff, and told me to keep it.
Presumably good customer relations - it's still my favourite co. for online clothes shopping.