Once (and if) you exhaust all options mentioned by HNers, trying emailing Jeff Bezos and write a proper explanation with kind of tldr; in the first para.
I know it sounds stupid but it worked for me. I had a $$$ of affiliate payment pending with them and the CS staff dilly-dallied the payment - to my Indian account - for more than 10 months. I emailed, Jeff intervened, deputed his secretary on my case. He, in turn, got me in touch with India manager. The Indian manager bent over backwards and was extremely apologetic for the trouble I had to face and sent the amount quickly. He ended the last call saying for any kind of trouble with Amazon I can contact him.