UPDATE: First, we ended our advertising relationship with Amazon, as our lawyer felt that it created a grey area as to their page content being true (I've added a link to a screenshot below of the offending page for documentation).
Three weeks after ending our relationship, my internal team went through the standard Amazon forms to report this page, but hit a dead end, as many of their forms aren't set up to "report Amazon", but rather other publishers.
Our lawyer ended up sending a cease and desist, and the page was removed in 2-3 days and de-indexed from Google within a week. Pretty amazing.
I would like to add that the offending page was constantly being optimized - page layout, image sizes, products featured, types of products - meaning it was an active page they were managing.
LEARNING: Treat your brand like your crotch, and defend it as such!
Image of Page: https://drive.google.com/file/d/0B4YMo_XFUoBeMlprOGRMOGROMTg/edit?usp=sharing
Image of SERP: https://drive.google.com/file/d/0B4YMo_XFUoBeYlJQakxjcXBFOXc/edit?usp=sharing