I recently had a similar issue with non-delivery on eBay (not an audio item). I emailed the seller multiple times over several days with no response. Then I went back to the ebay item details page. There was a button - get refund, or something like that. I clicked it, followed the instructions, and had my $ back in a few days.
EBAY MONEY BACK.......WHAT A JOKE ???
Well I never received my item, sent over twenty e-mails to ebay....waited 14 days and not one nickle has come my way.......I talked with a very nice, heavily accented person in another country, could not understand him, and I read every document that e-bay can print to deceive a buyer into thinking something is being done........And I have received nothing but a head ache.......So the buyer should be ware........Its not as it appears on the internet