There's nothing worse to a company than losing a customer and not understanding why.
I think you'd actually be doing the Cooks a favor by contacting them. And if I was about to lose $6,000 I'd jump in my pickup and go for a drive...
Once, Saint Teresa of Calcutta took a starving child into market and asked the owner if he'd be willing to give the child some food. He spit on her. She replied, "Thank you for that gift for me. Now, perhaps something for the child?"
You have truly been blessed with awareness and the joy of the Holy Spirit. However, you've also been wronged. It would not be un-Christian to bring the matter up to the owners. Perhaps they can even help you out.