Faulty products and poor service

I recently purchased a brand new vehicle from one of your dealerships. A lot of things have gone wrong with this car. The mechanics themselves couldn't diagnose the problem! The whole point of purchasing a new car is for peace of mind, the fact that a lot of tempering has been done I do not feel is a fair sale of the car. I want a new car, I am not settling for less. I am not delaying one day further, either my car is replaced or I want my money back please... IN FULL! the act of passing the buck is really not fair and not remotely legal... SORT THIS!