Five or more years ago I bought a kettle from Amazon and two months later it starts leaking. Turns out it's a design flaw and a lot of reviews on the kettle mentioned the same issue. I sent a support ticket and they refunded me immediately and told me I could keep the kettle.
Then last year I ordered a knife on Amazon. A month later I receive a water flosser...
I contact support (which is now next to impossible to find in the UI) and they tell me they can't refund me unless I send the item back and they also won't be sending me my actual purchase. This was during lockdown and as I do not own a printer I was not able to print out the return slip. They also refused to come and pick it up. I got nothing, not even a "we're sorry" coupon; my account is over 20 years old.
So we went from automatic refund + you get to keep the item for an issue that was not their fault to them completely fucking up my order and then making me go through hoops, spend me own money to send their mistake back to them.
The good news is that there are a lot of different and competitive online retailers around these days, and a lot of shops are now online due to Covid. So it was not very difficult for me to stop using Amazon altogether.