I think Jim has pretty well summarized the situation, and there really is nothing else that needs to be added about this particular dispute.
I will say this...several years ago there was a discussion about having some mediation/arbitration services available in our community. Bob Marsh (for you newbies...he used to run Shelby and was the salt of the earth) sought me out and we started talking about how it would run. Unfortunately, not many mfgs/suppliers or their customers were interested. I knew it would work...I was a AAA arbitrator on several pro-pick hot rod builds that usually started with a verbal contract like:
"Hey...build me something that will win Oakland [note: yup...awhile ago]." "Ok...you got any specs?" "Nope...you're the expert."
Just sayin...