Information on Moon Valley Nurseries

I bought a weeping willow tree from the nursery in Chandler, and the tree died a month later. I had paid $300 specifically for a weeping willow, and I would not have bought another kind of tree for that money. Now, however, Moon Valley nursery says that not only will they not replace my weeping willow, but they will not refund my money. I understand there are no weeping willows available any more, but they will not return my money even though I told them that I did not want a different tree and that I had specifically spent that money for a weeping willow. Apparently they do not guarantee their trees, only that they will replace it with something you did not want after the tree dies!
I am posting this because people should be aware, as the manager of the Chandler store told me, they don't really guarantee to replace the tree with the same kind of tree,they just agree to give you something. But I actually wanted a weeping willow, not something else!