It is much easier to take the twist out of a narrower board. Sorry for the long post, but I am just sick over this problem. Any and all comments are appreciated. I would like to avoid repeating this experience and salvage what I can. I do not believe that you did anything wrong.
Twist is a defect that is common in the heart-center portion of the tree.
It is nearly impossible to prevent or even control well in drying. The tendency is in the wood. Twist seems more pronounced in the center portion of a log. In most states, a product sold must perform as it is intended. Small claims court may indeed be an option.