FashionLife Charged me for items advertised as free with shipping costs only Pennsylvania

Recieved an email from these people telling me that I had been chosen to recieve an item of my choosing for being an Amazon customer. I only had to pay shipping costs. Thinking this was through Amazon I chose a watch, and in addition was sent a pair of sunglasses for filling out a survey. I recieved these items a few days afterwards, but a few weeks later noticed a $200.00 charge on my credit card. I immediately called the company who told me that it had been a 14 day trial period and that I was now responsible for the cost of these items. The two people that I spoke to could barely speak English and so I never was able to fully understand what they were saying to me. Initially I was told that I would get a 50% refund, and when I said that wasn't good enough, they upped it to 75%. At this point I'm not sure what else, if anything, that I can do.