Tire Blowout problems of the 2011 Mercedes Benz E Class

5 months into my 2011 mb e350 bluetech lease the front left tire blows on a highway. The tires are runflat bridgestone turanza el400-02 moextended 245/45r17 95h. Stopped the car and saw the rim made a cut in a sidewall. Not repairable, had it replaced. 45 days later another front tire is again blown on a highway the same way. Put on a spare and ordered replacement. 2 days later - third tire blows the same exact way. All incidents are on the roads I travel for 10 years and never had any issues with my previous cars. Complained to local dealer and was told it was caused by my "way of driving". Ridiculous! tire repairman told me these run-flats are not flexible and have a very thin sidewall so it gets punctured by the rim. Since mercedes did not want to replace the tires for free, how do I get compensated for what I paid replacing their tires?.