Rear Suspension problems of the 2006 Land Rover Range Rover Sport

Driving on the freeway and my car came to a complete stop. The rear suspension dropped to the ground with no warning or no apparent reason. Then I felt my left tire go flat. Once chp and the tow truck got me off the freeway. I noticed that the entire rear suspension was on the ground. The suspension failure caused both of my rear tires to buckle inward causing the left one to blow and the right on gauged out on the inside. Land rover dealership diagnostic report showed suspension failure and they just pushed a button to raise it back up. They fixed absolutely nothing and expected me to pay for two new tires and wanted to send me back on the road. The manufacturer was no help either. I still pay this car note and to date have never driven this death trap again. Im a afraid it will happen again without any cause or warning.