I have successfully refunded items, highest one was 1900 dollars. I doubt anyone on this site has done more than I have. I have different methods than what's said above, but that's because I know different things. Just hit me up if you are seriously in need of help. Anything above 1000 involves an investigation.
Yea it works, Doesn't take a genius to do the Amazon Glitch, just order something, then when you recieve it, wait about 2-3 days and then go on Live support and tell them you have not gotten it.
If you do that, it will look too obvious lol... But I did do that right when I got it, and they basically told me to wait until 6EST tmmrw, and if I don't recieve it, then simply come back on Live support for a refund or another Xbox One lmao