It’s a scam. Amazon knows how to contact you and if there is any need, they can put things for you to read on their website. For a similar thing I called my banks actual security number and their message was quite clearly: “We will never call you on your phone”. What they do: Send you a text message “did you purchase this item at xxxx for £yyyy” and ask you to press “yes” or “no”.
I got half a dozen messages about an iPad that was supposedly ordered on Amazon from my account. I did press 1. I got through to someone, and I could here that the scammer was sitting in a room with other scammers making the same call; I could hear them talking. Amazon must have a real problem with people ordering iPads by mistake.
Rule: Amazon would have your name. If they don’t have your name, they are not Amazon. Amazon has your Amazon account number. If they don’t have your account number, they are not Amazon. Amazon doesn’t need your bank details for anything. If they ask for your bank details, they are not Amazon.