Give them a call. You'll likely get a lot farther talking to someone in a calm and rational way than with an email that can't convey your tone or intent. If you're a repeat customer, and you state your case that you really just want the saddle that was advertised and what can they do to help you out, I'm guessing they'll make it right. They know saddles are a very personal choice, and not interchangeable. Good luck.
Jim