2010 LAND ROVER LR2 Wheels Problems

I STARTED TO HEAR A WHIRRING NOISE SO TOOK THE CAR TO A REPAIR CENTER (WITHIN 48 HOURS) THAT WORKS ON LAND ROVERS (THERE ARE NO LONGER ANY LAND ROVER DEALERSHIPS IN VT) AND THEY FOUND THAT THE REAR DIFFERENTIAL WAS DETERIORATED (VISCOUS FLUID, METAL CHIPS SHREDDING). THE CAR WAS UNSAFE TO DRIVE - THEY FOUND THAT, WHEN THEY ORDERED THE REPLACEMENT PART, THE SUPPLIER IS GETTING THIS PROBLEM ON THIS MODEL 4-5 TIMES PER MONTH. THIS IS NOT SOMETHING I WOULD EXPECT ON A 3 YR OLD CAR WITH THE SUPPOSED DURABILITY OF A LR THAT IS DRIVEN ONLY ON REGULAR ROADS (NO OFF ROAD DRIVING WHICH SUPPOSEDLY CAN BE DONE IN A LAND ROVER). LAND ROVER SAYS THEY CANNOT DO ANYTHING ABOUT THIS BECAUSE IT IS 1) OUT OF WARRANTY AND 2) I DID NOT TAKE IT TO A LR DEALER EVEN THOUGH THERE WERE EXTENUATING CIRCUMSTANCES AS...