Sonic Electronix review: The seller sent defective item and still hasn't changed it

My deal with the company www.sonicelectronix.com was terrible, because I received defective accessory and immediately contacted the seller. I received the response, where the seller told me that the new order could take up to 60 days. I waited these 60 days and didn’t get the order, but the seller simply stopped to reply to my emails. I need help, because I need my money back.