bidz.com buyz.com Bidz.com are knowingly mislabeling their products and selling them! internet California

I've ordered many item from this site, especially in 2011. Many of the rings I bought were labeled as being 10K Gold. They were all just 10K gold plated, and the P10K stamp on them means PLATED 10K Gold. I only found this out over a year later, when I took them to a Jewelry Store, and they even did the scrub test to prove it wasn't gold. 

I see many people selling these rings they bought from Bidz on ebay and other online shops, all advertising them as gold and unknowingly or knowingly ripping other people off. 

Meanwhile, bidz.com and buyz.com continue to sell these same exact rings and still labeling them as gold and still for same prices, although they clearly know they're not gold, cause it's been years, and surely many customers have brought this issue up with them.  These are not honest mistakes. These are doings of crooks. This doesn't only apply to rings, but also other items I bought, like pendants.

I can't even get a refund from them because their return policy states that items must be returned within 30 days of receiving. Now I'm stuck with all this jewelry, for which I paid large amounts of money, and can only sell them for 5 to 20 times less than what I bought them for instead of making profit (i.e bought for $100, and sells for $5 to $20), as gold is worth 60 times that of silver.