Earlier quoted context omitted.
What are the chances a small seller will be financially able to litigate with Amazon? And even if they do and win, what are the chances they're in a better position than before, meaning it's not a Pyrrhic victory? Edit. These are actual questions, the US legal system is very unkind with those without very deep pockets, having the highest litigation costs in the world.
I don't know the specifics and I'm no lawyer but for the amount involved, could Small Claims court be an option? No lawyers involved and if Amazon doesn't send a rep, there can be a default judgement.
How are you going to force a large company to pay if they are already ignoring you?