Thanks, Zero.
I called the card service center again, but they can do nothing at all. Even spoke to a supervisor.
You must go through the email system, apparently. I attached a pdf of the main offer page, but I will certainly use yours when I likely get the brush off again.
If I don't get my $50, I'll sell the reader at cost on Ebay and pay off the card and cancel it, out of principle.
Is there any possibility I am supposed to get the $50 credit from Sony Rewards and not directly from Chase?