Buy direct from manufacturer. Samsung, Western Digital, etc all have their own online stores.
Their store seemed to operate primarily on incompetence.
I finally got my invoice two weeks later, still with no working shipping information, and the drive turned up days later still.
On top of their scummy behaviour around SMR disks, and their NAS solution, I think I'll be steering as clear as possible.
The vendor added a markup to Amazon prices, and fulfilled with Amazon. I'm pretty sure I got a fake, ordering direct from the manufacturer.
I'll withhold names, so as not to embarrass anyone.