Your group think is laughable. All of the flaming and finger pointing that started after the SZ announcement is without a doubt linked to the mix-up a few days before.
"I did not do this intentionally, I actually invoiced the AMS downpipes instead of the SZ downpipes on his invoice. I sent him the invoice, and he pointed it out to me, this was even before he received the product. If I invoiced the SZ downpipes, and sent him the AMS downpipes, that would be a different sorry, but this is clearly a mistake. My apologies, and we are working to get this fixed ASAP. Thank You.".