I have a similar story to most other people on here but with a twist! I am complaining about DXListing which is part of Deal Extreme where they sell products for other sellers rather like Amazon Marketplace. You still deal, or try to, with Deal Extreme and receive the same dreadful non-service. I have had the usual "please be patient and wait" messages but when you are told that the original estimate of 7 - 21 days delivery should actually have read "2 - 6 weeks" you start to lose patience. Not only that but the 2 - 6 weeks are Chinese weeks as they do not include weekends and public holidays so, how long is a week? Is it 5 days or is it 7?
DX stopped responding to my messages when I asked for a refund so I have just filed a dispute with PayPal as it is 42 days since the original order was placed. We'll see what happens but, my advice is; DON'T BUY FROM DEAL EXTREME!
Update: I got my refund so, at least the PayPal refund system worked.