Best Buy review: Best buy - absolute scammers

I purchased a Yamaha AV Receiver online from Best Buy online for $749.99. I got a Best Buy receipt and paid via paypal. Paypal paid bestbuy.com. The item stopped working days later and I called Best Buy for an exchange. They would do nothing. They said a "third party seller" sold it to me even though paypal paid BestBuy.com. They gave me the number of the "third party seller" and they would do nothing either. I put it in dispute with paypal but Best Buy is fighting it. All I want is an exchange and Best Buy refuses to do anything. BEWARE - THIS LARGE CORPORATION is VERY DISHONEST.