Other Fuel System Tank Assembly problems of the 2009 Volkswagen Touareg

My 2009 vw Touareg tdi experienced a failure of the reductant pump for the diesel emission fluid system (def. ) researching failure rates of this system has shown a very high failures of this system in the vw Touareg and passat clean diesel application for model year 2009 and newer. Proposed solution to reduce crystallization and clogging of system has resulted in 3 service revisions, with the most recent calling for removal and replacement of the entire system (tank, pump, line and injector) at a cost of $1,5000. Vw will not cover any costs or issue a recall. This same system and parts are used in the Ford f350 and Chevrolet duramax clean diesel applications with similarly high failure rates to the best of my knowledge all light duty clean diesel manufacturers are experiencing a failure of this system with no recall or coverage against future failure. It is apparent that the supplier of the def system used in common light duty vehicles manufactured faulty parts on multiple vehicles. The manufacturers of these vehicles have records of the failure rates and can demonstrate that the system has been faulty, which results in non compliance of federal emissions standards. What steps can be taken to investigate this and provide a long term solution?.