2000 Subaru Outback

MY SUBARU OUTBACK 2000 WAS BROUGHT TO A SUBARU DEALER IN SIOUX FALLS, AFTER BATTERY DIED, AND THEY CHANGED ALTERNATOR AND BATTERY, AND THEN THEY ALSO STATED THAT BRAKE PAD NEEDED TO BE CHANGED, SO I AGREED AND THEY DID. IT WAS IN MID AUGUST 2009. SINCE THEN I DROVE THAT CAR BETWEEN SIOUX FALLS AND ROCHESTER MN, WHICH IS ABOUR 240 MILES ONE WAY OVER THE WEEKENDS. ON SEPT 20TH, WHEN WE WERE DRIVING BACK FROM SIOUX FALLS TO ROCHESTER, I NOTED SOME NOISE COMING BACK FROM THE LEFT REAF WHEEL, AND IT BECAME WORSE. EVENTUALLY THAT CAUSED VIBRATION, AND COULD NOT KEEP GOING. WE WENT OFF FROM HIGH WAY, AND CHECKED THE CAR, AND FOUND THAT THE WHEEL NAT WAS GONE, AND OTEHR NATS WERE ALL LOOSE. THE CAR WAS FIXED AT A LOCAL ROCHESTER REPAIR SHOP, AND I CALLED SUBARU DEALER IN SIOUX FALLS ABOUT THE INCIDENT. THEY SAID IT IS JUST A MATTER OF MILES I DROVE AFTER THE SERVICE, AND ALUMINIUM WHEEL CAN CAUSE THIS, SO THEY DO NOT FEEL THEY ARE RESPONSIBLE FOR THAT. IT WAS VERY DISSAPOITING CUSTOMER SERVICE, BECAUSE I WAS A FUN OF SUBARU. I REQUESTED THEM TO SEND ME A LETTER TO DESCRIBE WHY THEY CAME UP TO THE DECISION, BUT THEY IGNORED IT EVEN AFTER MY REPEATED REQUEST IN OCTOBER, AND UNTIL NOW, NOTHING WAS DONE. I CONTACTED SUBARU COMPANY, AND THEY CONTACTED THE DEALER, BUT THE DEALER STATED THAT MY VEHICLE TRAVELLED ALMOST 2000 MILES BEFORE THE PROBLEM WITH YOUR LUG NUTS STARTED. THE DEALER FEELS THAT THE CAR WOULD NOT HAVE LEFT THEIR SHOP IN AUGUST WITHOUT PROPERLY TIGHTENED LUG NUTS, BUT IF AN OVERSIGHT HAD OCCURRED, THAT I WOULD HAVE NOTICED THE LOOSENESS MUCH SOONER FROM THEIR OPINION, IN WHICH CASE THEY WOULD HAVE CORRECTED THE PROBLEM FOR ME. THIS SOUNDS ALMOST IT IS MY FAULT NOT REALIZING THEIR POOR PERFORMANCE IN THEIR JOB. THE DEALER FEELS AT THIS POINT THAT THEY ARE NOT REPOSNSIBLE FOR THIS CONCERN AND ARE UNWILLING TO COMPENSATE US FURTHER. IF THIS IS NOT THEIR RESPONSIBILITY AS A PROFESSIONAL TO REPAIR AUTOMOBILE, WHO CAN EXPECT A CAR DEALER TO REPAIR OUR CAR SAFELY?