There is a saying that goes way back; "The message sent was the message received", the sender is always responsible that the receiver understood the instructions correctly.
Not taking any position here, however when trying to understand why things went bad, always first look in the mirror. After that recovery is the next step and negotiation will go the furthest when coming to a resolution. IMHO
Crayon diagrams to go with the tape and pics?? Its just just poor work period. Sorry you had to experience this Utah...
