I think I tried that, but I didn't have enough "balance" on the account that I had just created to register the complaint.
I guess you have to spend a certain amount before they care about your opinion.
In a similar situation, I had someone not only 'publish' a book using a different name (but using my cover, complete with my name on it), but actually stole my ISBN I'd paid for (and had stupidly listed on my website before actually publishing the book). What I did was to 1) post reviews, stating that you're the true author, that the books published are a clear copyright infringement, and that readers shouldn't support the fake author, and 2) I changed the ISBN entry, declaring it an invalid copyright infringement, so that anytime an organization ran a check on the number, they'd see the message and (hopefully) think twice before considering accepting it.
Not sure it helped, but it's at lest a way of getting the word out.
BTW, if you want me to register the protest in your name (since I have a history with Amazon), I can do it, but as Ernest suggested earlier, I need to be acting as your 'representative' (i.e. you have to ask for me to present your case for you).
However, Amazon is notorious for not giving a shit about what author's think, and they'll only remove completely fraudulent books, after weeks of knuckle dragging, if they think it's likely to hurt their reputation by refusing to acknowledge the copyright abuse. They don't do it for the authors unless they create a stink about it!
That precisely why so many authors, and major publishers, refuse to have anything at all to do with Amazon.