BEST BUY FRAUD

I purchased a Xbox 360 console on the 27th of Dec. Upon opening the console and attempting to plug the power adapter into the back of the system, i found that the cord didn't fit into the console. I called microsoft that night for troubleshooting and after them not being able to assist me..they advised me to bring the system back to best buy for an exchange. The next day i did just that. When they scanned the receipt and the console, it turned out the serial numbers on the console and receipt were different and they wouldn't give me an exchange. I feel I am a victim of a scam. The manager, Chintu Patel, was no help. I called microsoft again and they said it's Best Buys problem. I called Best Buy Customer relations and they told me that because the receipt serial number doesn't match the console serial number that there is nothing they can do. I also went to the Woodbridge Police Dept on the 28th of Dec to try and file a police report but they wouldn't let me because they said this is not a crime. What?! I don't know how this was done but I am the victim here.