2017 BMW 3 Series Tires & Wheels Problems

I'M LEASING BMW 330E. IN NOVEMBER 2017 I BROUGHT IT WITH 5,800 MILES FOR MAINTENANCE TO THE WEATHERFORD BMW; WAS ADVISED TREAD OF REAR SET OF TIRES IS DANGEROUSLY SHALLOW, UNDER 5 MM. THEY ALSO TOLD ME THAT FRONT SET IS STILL OK WITH 6 MM, BUT SOON NEEND TO BE ALSO REPLACED. I CONTACTED THE BMW NA, OFFERED A 50% DISCOUNT ON A SET OF NEW TIRES. THIS OCTOBER 2018 AT 2ND SERVICE SERVICE I WAS ADVISED THAT THE THREAD NOW ON THE REAR SET IS UNDER 3 MM AND PRESENTS A SAFETY HAZARD TO CONTINUE TO OPERATE. THE FRONT SET OF TIRES HAS ONLY 4 MM REMAINING THREAD. THE VEHICLE HAS ONLY 11,250 MILES ON THE ODOMETER. WHEN I CALLED THE BMA NA ABOUT THEIR LAST YEAR OFFER, I WAS TOLD THAT THEY HAVE "TAKEN THE OFFER OFF THE TABLE". BMW BILL FOR THE NEW 2 TIRE SET WITH BALANCING AND ALLIGNMENT AT $1,006.60 IS ATTACHED TO THIS EMAIL. THESE ARE RUN-FLAT CONTINENTAL CONTIPROCONTACT TIRES. THE CONTINENTAL TIRES COMPANY HAS RESPONDED TO MY ONLINE INQUIRY WITH THE ANSWER THAT THE ORIGINAL TIRES ON THE NEW CARS HAVE NO TREADWEAR WARRANTY, BUT THE REPLACEMENT OF THE SAME NEW TIRES DOES COME WITH A 40,000 MILES TREADWEAR WARRANTY. BMW SERVICE CHARGES $500- PLUS PER TIRE FOR REPLACENT, INCLUDING THE BALANCING, ALLIGNMENT AND TAX. SINCE THE AVERAGE MILEAGE IN THE USA PER CAR DRIVEN IS ABOUNT 12,000 MILES ANNUALLY AND THE BMW VEHICLES OWNERS, OR A LESSEES ARE SUPPOSED TO CHANGE IT AFTER JUST 12,000 BECAUSE THE NEW TIRES ARE WORN AND HAVE NO FACTORY, OR TIRE MANUFACTURER'S WARRANTY, THAT MEANS THAT THE ANNUAL COST FOR TIRES OF ONE BMW VEHICLE IS $2,000-. THAT IS UNACCEPTIBLE AND IS A DECEIVING PRACTICE. I SUSPECT THAT BMW FACTORY IN GERMANY PURPOSELY EQUIPPING THEIR NEW VEHCILES WITH SUBSTANDARD QUALITY UNWARRANTED CONTINENTAL RUN-FLAT TIRES TO WRECK ON UNSUSPECTING USA CONSUMERS THE COST OF ANNUAL REPLACEMENT WORTH OF $2,0000- PLUS ANNUALLY, OR $500- PLUS PER TIRE. PLEASE INVESTIGATE.