I've traded in a couple devices with Samsung. I'm extra careful on documenting and monitoring throughout the process, because of all the problems I've seen posted here on AC. So far, I've had no problems.
Samsung is very slow on sending acknowledgements and updates throughout the process. In one case, my credit was posted before they even scanned in the receipt of the trade in device!
[TL;DR] Silver Sharpie mark was considered "Damage" on my Buds Pro and repair was refused, wiped off, sent back and fixed now...
I remember this one time I sent in my Buds Pro's in for service. I had the earbuds case in another case, but it looked the same on almost all sides, so I took a Silver Sharpie Marker and put a mark on one side. It happened to also mark the original buds case as well.
The left one stopped accepting touch inputs, so I did the thing, made a ticket and got a label to ship it back as they were under warranty.
I took them out of the case, cleaned them up a little and sent them back.
Warranty Repair was DENIED because the "Case shows damage".
They sent it back without fixing it with a picture marking the case damage.
It was the mark from the Sharpie.
I wiped it off, called them back, read them the riot act and sent them back in to be repaird.
They fixed it that time.
It's stupid crap like this that makes me think that they are just LOOKING for ways to not honor things, but the more we document, keep proof and show that we can back up our claims, I hope, they will, eventually, learn that they just need to provide good service and that will bring customers running.
Oh well.