Yes, i understand the requirements. You cannot force them to give you something they do not have. While you may be unhappy with the MSC and choose to terminate, that is fine. I'm trying to think of a way to "save the shop" and make everyone happy. I definitely would have "snuck" a picture of an employee (even if it wasn't the one I was working with). I also might have considered making a purchase of a part (even if it was $$$, get the receipt and go to the car and take a picture. Then come back inside and do the return. I know it involves extra steps, but you already have a sunk cost with the time you were there and invested. You obviously felt the shop paid enough for you to take the assignment. So why not consider a way to salvage the shop?
I appreciated your Terminator stories, but in the end, you "threw away" a company that you obviously were willing to work for if the pay met your criteria. You not shopping for them won't even cross their mind in the future, but instead you won't be able to do the assignments you were willing to do.
Now, if I had done what I suggested (picture of employee and/or a purchase with receipt) and an explanation of what I did to "save the shop" since there was no business card AND they still rejected it, then I am all in on the termination. I'm only saying for myself on a shop, "What can I/should I do if something needs to happen and they do not have it?"