www.electronicDealz.com electronicDealz sent us a used tablet, which was also defective. Gilbert, Arizona

I purchased a 10" Superpad tablet from Sears. It was shipped from a company called electronicDealz.  When I received the tablet I determined it was a used tablet, how did I know? it had emails on it from the previous owner.  I contacted the previous owner and he said it was defective and he returned it to electronic Dealz.  He also said he has had no luck in getting a replacement or a refund.  I finally got a telephone number from Sears (who incidentally would not help me at all), I called electronicDealz and got a message of course, it said go to the website for returns.  I went to the website, sent them an email and got back an immediate email that included allot of boilerplate stuff and also included directions for returning items.  I returned the tablet on December 10th, 2011.  I got the proof of delivery from the post office, have not heard from them since.  I have emailed them several more times, and of course I get the same automatic email.  I don't know what more I can do.