jewelry unlimited Unlimited/D.Bazaar Defective/damaged/jewelry atlanta, Georgia

I first encountered jewelry unlimited/D.Bazaar on Ebay they also have a location in Atlanta Ga I purchased diamond earrings and a diamond necklace. I received the necklace and was very disappointed the diamonds where chips literally you could barely see them. I take the necklace to my jeweler because the necklace would not lay flat on my neck to see if they could adjust. They tell me the metal is roduim not 10Kt as advertised and that it was splitting in 5 places . They suggested I throw it in a drawer because it wasnt worth anything. I was irrate I spent my money for a 10kt white gold 3ct diamond necklace and it wasnt worth anything.  I called them and expressed how unhappy I was with the necklace they told me to send it back and my own expense I couldnt receive my money back but that I had to exchange it. So I exchanged the necklace for 2 diamond bangles thinking I would not have issues with those. Well within 1 month 1 bangle tarnishes and a diamond falls out.  Once again I call and email and they tell me that silver tarnishes silver I thought it was 10kt gold they falsely advertise once again. So they tell me its nothing they can do I send it back once again at my own expense and they tell me all they can do is dip it and will not replace the diamond. Now on there Ebay site they say that they stand by there jewelry and that they will replace for up to 2months. Once again false advestisement. A complete rip off jewerly should not be defective, tarnishing or stones falling out in 1 months. Jewelry should not be advertised as 10kt and its rodium or 10kt and it sterling silver. So I dont want anyone else to be fooled or get ripped off