My best was quite a few years ago: I ordered a fairly large organizer - with bins, etc. perfect for my daughter (she still loves and uses it) and at a good price. Picked it up from the post office (P.O. Box). Barely fit in my car. Two days later, another pickup notice, same number, almost the same tracking. It was another of the same. We had no room for the second one, so I refused it and had it sent back. Called & told them what had happened. Even after several phone calls, I could not convince them to undo the full refund. A friend explained that this was probably due to internal tracking and potential employee theft issues. I stopped trying.
Another time, my adjustable desk, thru a kickstarter, arrived with the motor attachment wings damaged. Called/emailed the one person who was in charge of all shipping/customer service. Very nice person. Arranged for replacement part. Requested I send back damaged part. Delivery guy was not pleased when the two large, heavy boxes he hoped to get off his truck were not getting off, but, the customer service representative was really happy that I was sending back the mis-shipped desk.