This is number that comes up when Amazon driver needs instructions. Don't know why anyone would rate it bad, unless you don't like getting stuff you paid for. Only gripe is it should come up with name Amazon rather than just a number in this day and age. Lots of people won't answer random numbers - that's just the world now.
This is amazon delivery's number. If the driver calls you, answer it as they are looking for your house or at your door and need you to accept your goodies!
It's a number used by Amazon to connect you with the delivery driver - When they're calling, This number will appear instead of their mobile number. Entirely safe - they use it when they can't find your delivery location.