Enterprise apps distributed via MDM & signed using in-house distribution certificates are dead in the water too with the error message "Unable to Verify App" showing on start-up.
Apple's status page is showing no problems (all green).
I recently had this experience. I ordered a pack 5 toyota oil filters for my vehicle. When the box arrived, I was shocked that where was only 1 filter in it.
I contacted amazon customer service and, at first they wanted me to ship the one filter back, so I would receive a full refund. I told them that I'd like the other 4 shipped to me, and that I need to keep the 1 filter as I was planning on doing an oil change that day. BTW, 1 filter costs like $5, so the cost of shipping it back would have outweighed the benefit.
They refunded me and told me I don't have to return the filter.
There are a number of items whose quantity is listed in the title/description rather than the item quantity when you add it to your cart. I think this causes confusion at their warehouses, and the pickers/packers are messing up. I had the same issue happen with a set of 2 pillows, only 1 arrived in the box... amazon shipped me 2 more free of charge.
Their customer service has been spot on. Considering I spend probably a few grand a year buying stuff from amazon, I'd expect no less from their customer service.