Automatic Transmission problems of the 2009 Mazda CX-7

I just bought a 2009 Mazda Cx-7 three weeks ago, while driving my car on the third week, my car stopped shifting gears. As I was driving down the highway it just stopped. I had the care towed into the same dealership I bought the car at, and come to find out the transmission went out on the car. I took the car into the dealership on Friday, December 12, 2008. I was told that I would receive a call from someone on Monday, I waited and finally went to the dealership my self and they had no answers about the car. I then called Mazda's customer service line and made a complaint about what was going on and they told me that they would call me back with what was happening, at the time they called me back is when I found out about the transmission. I was informed that they needed more time to get more info and that they woul;d call me back. I waited until weds. . And I received a call and was told they still have no information for me and that the eta of fixing my car would be anywhere between three to four weeks. So tell me can I do, does my car fit under the lemon law, should they give me a new car? what do I do and where do I go from here?.