I doubt you'll get someone on a Sunday. My reason for recommending this approach is that three years ago I had problems with several new D700 replacements. It reached a point where the 2nd one was really messed up by tech support (Melville) after two attempts at fixing it. I then turned to Corporate Customer Service and after some persistence and letter writing was awarded a new camera, which worked fine.
I'm sorry you have this problem. Nikon should not treat its customers this way, but they are. As soon as we realize that, going to Corporate sources for resolution may be the best (and only) way to handle these issues.