Hmmm
Were they Tesla's contractors or Walmarts?
I've been on jobs where the customer has insisted on supplying their own fitters, then tried to screw over our people when the inevitable disaster happened. On one occasion where I had a personal interest (as I designed the kit), I kept a very detailed diary of events. It ran for two years! When it came to legal threats, I mentioned it to our solicitor. She took one look at it and quite literally danced round the room.