I have used Amazon for many years without a problem save two times and in both cases, it was an Amazon re-seller based in the USA.
The first time, my credit card details were clearly passed on and used to buy a plane ticket from Miami to some island in the Caribbean. OK VISA refunded me but Amazon were in total denial that my cc details had been mis-used.
Then recently, I bought a book from a reseller in Chicago which never turned up. All sorts of excuses but the first approach by Amazon was to deal directly with the reseller, which as I say had lots of excuses but no delivery. It took some time and some shall we say frank exchanges of emails but today I was informed that Amazon would refund me.
I have never had a problem with any Amazon reseller in Europe and Amazon UK have always been very responsive even refunding in one case, the return postage when it was my purchasing error.
The point, my counsel is never use an Amazon re-seller that is based in the USA as based on my experience they are shall we say not as reliable as we have the right to expect.