I didn't make this up. This was a promise you made (or at least, that I think you made) when I was deciding (whether or not) to do business with you.
Believe it or not, our entire future relationship rides on the outcome of this one little thing. After all, I'm only doing business with you because the last company... er, let us just say, failed to meet my exacting standards.
I don't want to have to jump through hoops. Just get it done.
Even if you fail at this, I might still do business with you for years to come. After all, things are 'sticky'. But I promise you this: if you let me down, I will forever after be open to alternative solutions.
Oh, and yes. My expectations are unrealistic. But the only reason I ever became a 'fan' of your company in the first place was because of your wonderful performance in the past. Do you really want to let me down over something this small?
And then, when the next company does better, goodbye.