Its apparently the USB cable, but they want me to return the camera for repair too. So maybe its both, and they aren't admitting that?

I'm currently writing the letter to go in the box with the camera, and don't know quite how to phrase the letter... I want to say "well, you made a camera/USB with an obvious flaw. What are you going to do when the warranty runs out? Why not give me a whole new camera as a replacement in good faith? An upgrade would be nice!" Alas, I can't

Here's what I've got thus far (I know it still needs work)
Dear Nikon Repair,
I am sending you my Nikon Cool Pix 4300 camera for repair. This is the second time I am submitting my camera to you for the same problem. I cannot download the photos from my camera. It seems as if the USB is faulty.

Attached is a copy of my receipt; the camera should still be under warranty. Since this is the second instance of this problem, what can be done to ensure it won’t happen again? I don’t want to be faced with this problem after the warranty has expired.
Any ideas/suggestions on what else I shold say? Or how I should rephrase what I have already said?

~Kim