What kind of legal action can I take? Concerns store in mall.

I purchased earrings from one of the mall booths at the mall; I asked the associate for 18 mm earrings he handed me 4. I found that they were not 18 mm but 16mm. After much hassle the associates manager returned only 3 of the 4 "because [I] wore one". She never gave my original receipt back or return receipt. She said, "I need the original receipt for my records and I don't give copies for return receipts because we don't usually allow returns." So in other words, I was given no documents. My return never showed up after a 5 days like it was supposed to. I went back and the manager told me it's my credit card companies fault (It's not). And she said she won't fix my return. What can I do? She technically had me return my earrings without giving me a refund.