2003 LAND ROVER RANGE ROVER Suspensionfront Problems

I HAVE A 2003, RANGE ROVER HSE. THE AIR SUSPENSION INACTIVE WARNING LIGHT ILLUMINATED AND THE WHEELS SHOOK. I TOOK THE VEHICLE IN (12/29/08). THEY COULD NOT FIND THE PROBLEM AND SUGGESTED AN ALIGNMENT. I GOT THE ALIGNMENT AND THEY CLEARED THE WARNING LIGHT (1/2/09). I LEFT AND NOTICED THE VEHICLE STILL FELT OUT OF ALIGNED. LATER THE WARNING LIGHT (AIR SUSPENSION INACTIVE) CAME ON ONCE AGAIN (1/15/09). THIS TIME THE LEFT FRONT WHEEL FAILED TO RAISE UP. I BROUGHT THE VEHICLE BACK IN. THIS TIME THEY TOLD ME THE AIR SUSPENSION WAS LEAKING AND NEEDED TO BE REPLACED. IT COST ME $2900 (1/22/09). I TOOK THE VEHICLE HOME AND NOTICED THE VEHICLE WHEELS STILL SHOOK. I REPORTED THE PROBLEM BUT REFUSED TO BRING THE VEHICLE BACK IN. RECENTLY, THE WARNING LIGHT (AIR SUSPENSION INACTIVE) ILLUMINATED ONCE AGAIN AND NONE OF THE WHEELS WOULD RAISE (2/22/09). I HAD THE VEHICLE...