I'd be pretty upset myself, and likely not take my work back there. But other than that, you've likely done about all you practically can do. Since the damage covers a fairly significant portion of your composition you can't even do much of a repair in photoshop. Cropping it out doesn't look too bad, but of course not what you had in mind. And even that is likely not the point. What does the other end of the roll look like? Is there a lot more free area than you'd expect? One of the problems I've sometimes had with medium format roll film is not lining up the arrow exactly when I load. There is not much room for error.