1997 Volkswagen Passat

SEAT BELTS NEVER RAVAL ALL THE WAY (MINOR ISSUE), AIR CONDITIONER GETS COLD ONLY FOR ABOUT A MINUTE (ONCE AGAIN MINOR), AND NOW IT MISFIRES ON CYLINDERS 5 AND 6. I HAVE REPLACED BOTH O2 SENSORS, THE COIL PACK (3 TIMES), IGNITION WIRES (TWICE), SPARK PLUGS (TWICE IN 4,000 MILES), AND THE ECU. STILL MISFIRES AFTER 3 SHOPS AND THE DEALER HAVING IT TWICE FOR ABOUT 2 WEEKS STRAIGHT (KEN GARFF OREM VW/AUDI DEALERSHIP). THEY TOLD ME "THERE IS NOTHING WE CAN DO", VW AMERICA SAID "THERE IS NOTHING WE CAN DO, THOSE DEALERSHIPS ARE INDEPENDENT FROM US". THE DEALER THE FIRST TIME I BROUGHT IT IN, BROKE SOME ENGINE COVERINGS, THAT I HAD TO COMPLAIN ABOUT TO HAVE THEM DECIDE TO REPLACE. THE NEXT ROUND I GOT THE CAR BACK AND THE HOOD WAS POPED A LITTLE BIT BUT CLOSED (I LIVE 2 MILES FROM THE DEALER). SO I DECIDED TO TAKE A LOOK AND NOT TO MY SUPRISE, THEY LEFT A FEW ENGINE COMPONENTS UNBOLTED AND SITTING IN THE ENGINE COMPARTMENT. THEY ALSO LEFT THEIR TOOLS AND THE BOLTS IN SMALL CASIM PARTS OF THE SHEET METAL. THE WIRE HARNESS WAS LOOKED AT AND THEY CONVIENIENTLY LEFT THE WIRES CUT BUT NOT ALL THE WAY THROUGH. VW AMERICA ALL THROUGH THIS SAID ONLY THAT I CAN COMPLAIN AND THAT THEY WILL "NOTE THIS IN MY RECORD, BUT THATS ALL WE CAN DO." THEY HAVEN'T EVEN OFFERED TO HELP ME FIND A NEW DEALER OR TELL ME A TYPICAL WAY TO FIX A MISFIRE.