Amazon is a massive company. If they get an order wrong, they generally let you keep it anyway because it is not worth their time to get you to send it back for an exchange.
I was given my first UHD disc the other day by a client because they sent him two copies of the same title. These discs are like $50 each. Their turnover is so HUGE that they can also cover items and claims for items that go missing.
What annoys me is the people that think every business selling things online are the same. I've been selling on line since 2006. I have done OK over the years but I am not so well off that I can just give stuff away (even though I do from time to time) because someone puts in a dodgy claim. I have had to deal with my fair share of people that doing stuff like that I have to ask how do they sleep at night? Some of the things people have pulled include providing the wrong shipping address (PayPal actually back me on this instance) to deliberately breaking the item and them putting in a claim for refund (not replacement?) of the item because their wife found the credit card statement, then went off at them for buying items they clearly should not have. PayPal backed him is this case leaving me several thousand out of pocket.
Well we don't, but the fact that he has delivered quite a few pairs as well as he is now a premium member here backs his reputation up quite a bit.
It would depend on your bank. I know that mine would not as it sees this too high a risk and anyone wanting to make such a purchase would do so at their own risk. I know that back 2012, when the launch of the V2 for $109 went belly up, it was the website I purchased from that got me a refund. My bank didn't want to know about it.