Dissatisfied customer

I am disappointed in the quality of the product that was sent to me. It did not correspond with what I ordered on their site. I have tried to make contact with their customer service team within the 30 day return policy, but have received no response from them and the 30 days have expired. I have wasted a lot of money on a cheap quality product that is far from what I ordered on their site. I feel that I have been cheated. How do I get my money back?