So, and this is a hypothetical of course.
Let's say I purchased something with a coupon code. Was worth about $350 but it brought the price down to around $100. The product is faulty, so I return it and purchase something else. When processing the refund and purchasing the other item, the cashier sees the attached price tag (the original price) and despite the discount appearing on the receipt, which I brought, they refund the $350 instead of the $100.
If you don't notice it at the time, but after you've left the store and go home, do you go back and correct the mistake? Yes/no and why?
I would have noticed straight away as I would normally be in a heightened state of alert during refunds.
I would smile, thank the cashier, walk out and sleep well that night.