Extended warranty issues with Best Buy. Any advice?

I bought a Canon EOS Rebel T2i camera from Best Buy. At the time of purchase they told me that I needed to buy the extended warranty because if anything happened to it they would give me a new camera. I asked what the warranty was if I didn't buy the warranty and they said it was a 1 year warranty but it would be sent out for repair in house. I purchased the camera 12-26-2010 and the extended warranty for 1 year. After 5 months an internal crack in the LCD appeared. The camera was in safe care at all times and treated very carefully. We brought the camera to Best Buy where we purchased it. They said the repair would take 10-14 days and would be free of charge. I was shocked and said I thought I would be getting a new camera instead of it having it to be repaired since I bought the preferred warranty. They then told me that it would have to be checked out first. After three weeks of the camera being repaired, we called Best Buy and asked if it was back at the store. They said that they would replace the camera and needed us to come to the store and show us what it could be replaced for. They looked for the same camera to replace it and all they had was a camera listed as a shelf display. Since no camera was available we decided to go with the T3i because the T2i was being discontinued in 2012 and will not be restocking it in there store. They said we would have to pay the difference of $100.00 of the two totals. We agreed to that, but when we got to the customer service desk the cashier said that we would have to buy ANOTHER 1-year warranty. Best Buy did not hold responsibility to their word, and somehow by replacing the camera the previous warranty would be fulfilled. I am very dissatisfied that I have spent nearly $1000 and have had very poor outcomes with this camera and Best Buy.