Brand new phone number and already received my first scam call!
I would like to point out that these calls are actually not from Amazon, they are simply purporting to be from Amazon. The call I received was from 07456221385 and it said in a very automated voice that an unauthorised purchase of an iPhone had been made from my card. Yeah right, thanks!
Hung up and blocked. Please do the same if you receive a call like this. Also, comment with details here so that others know what to watch out for.