2011 BMW 335D Tires Problems

I PURCHASED 4 REPLACEMENT RUN FLAT TIRES FOR MY WIFES BMW 335D WITH 40,000 MILE TREAD WEAR WARRANTY. AFTER 20,000 MILES THE FRONT TIRES WERE HALF WORN AND THE REARS WERE NEAR BALD. I CONTACTED TIRE RACK, WHERE I HAD PURCHASED REPLACEMENT TIRES, AND THEY SENT OUT 2 REAR REPLACEMENT TIRES TO THEIR LOCAL INSTALLER; WHICH I FULLY PAID FOR PENDING RETURN. UPON INSTALLATION IT WAS DISCOVERED THAT THE TIRES I HAD ORIGINALLY PURCHASED FROM TIRE RACK WERE NOT RUN FLATS BUT STANDARD TIRES. THE TIRES LOOK FROM THE OUTSIDE EXACTLY THE SAME, BRIDGESTONE RE960 VS RE970S. THERE IS A BIG DIFFERENCE IN PRICE AND YOU ARE NOT SUPPOSED TO MIX NON RUN FLATS AND RUN FLATS. I CONTACTED TIRE RACK AND THEY WOULD NOT HELP. THEIR CUSTOMER SERVICE WOULD NOT LISTEN BUT BLAMED THE PROBLEM ON ME OR THEIR INSTALLER. WITH SOME INVESTIGATION I LEARNED ABOUT DOT NUMBERS AND...