I had a genuine e-mail from Amazon once - something to do with a change of credit card - and it didn't mention my name. It arrived just as I placed an order, so I guessed it was probably genuine, but it was asking me to go to a site and enter my CC details. So I called Amazon's customer support and they checked, determined that it was genuine, and I was good to go.
That was my second ever call to Amazon. The first was about a shipping charge problem. It was sorted out over the phone, with an e-mail confirmation 15 minutes later and a very favourable interpretation of the difference in the charges credited to my account. I would unhesitatingly recommend their customer service, in the same way that I would unhesitatingly recommend disembowelling yourself rather than embarking on the nightmare journey to hell that is involved when attempting to get support from PayPal.
Born 11/1960, retired June 30, 2012; DW born 07/1957, retired July 31, 2019. Current portfolio is 2000K Euros, split 30 stocks/20 bonds/20 RE/30 cash.