Actually, even shipping an upgrade as a surprise could be a problem, as your system might not be able to use it. They should ship the correct item or offer a refund. If they ship anything else, then it should be considered an additional freebie.Is it amateur hour over at Rakuten and Adata? This is classic bait and switch. No site policies or terms and conditions are going to override legal precedent here. The explanation for how this happened makes it obvious the whole thing is intentional too. You can't just substitute an inferior product and send it out without consent like this. Was anyone paying attention in Business Management 101?
The 8100 drives are considered unsolicited gifts that consumers are not required to waste any time sending back. Free return shipping does not negate this fact. Rakuten and Adata need to send out those 8200 drives or cancel-refund the orders.
This story makes me want to avoid doing any business with Rakuten and Adata. Want to give consumers a surprise free upgrade? Sure, fine. A surprise downgrade -- oh hell no!