Engine Clicking And Tapping Noises problems of the 2008 Nissan Rogue

We bought a car last Monday on may 26, 2014 at antwerpen Nissan security dealership (1701 woodlawn drive, baltimore, MD 21207). Please find the car details: year: 2008 make: Nissan model: Rogue body type: 4dr sl fwd trim: sl black VIN: jn8as58t28w013971 odometer: 78321 with a dealer warranty for one month or 1000 miles, powertrain only ; for the total cash delivered price of $13,000. 00 (thirteen thousand us dollars) already paid by check on may 26, 2014. The second day we were facing problems with the car as the motor was overheated in very few miles, it was smelling smoky inside and the motor was making cracking noises even when it was turned off. We called immediately the sales manager and let him know that we want to turn the car back as it is not functioning properly. The day after we almost get an accident in the traffic that put our life in danger. The car lost power while driving: gas pedal was fully pushed down and the tachometer showed 3500 rpm while the speed hardly reached 20 mph for about 2 miles till we pulled over at bel air road. We decided to call the general manager for turning the car back as it was within the warranty and I was very clear to him that I do not want that car any more. He agreed to do so, and on last Friday may 30th, 2014, they carried the car from our home location. We requested the money back. Since that day we have being waiting for days and hours in the dealership offices for a response of our request, but they lied to us all the time and last night after many attempts on deaf phone calls the response was: no, they are not giving us the money back. The car dealer pretend that this dangerous car has no problems at all !!!.