Fail To Accelerate problems of the 2007 Mercedes Benz C230

Balance shaft premature failure found by cel (check engine light) during diagnostics check at Mercedes Benz of nashville, TN. The engine has been running well so I was shocked that the first time my check engine light came on that the repair is the balance shaft $5,600 repair. Mbusa refused good will assistance to service director bill hudson on 8/21/13. The service report shows all engine related checks are green/good except for the check engine light reading balance shaft replacement required. I drive over 100 interstate miles daily so the warranty is exceeded quickly. Based on # of claims this is a common problem that will eventually be a safety hazard because the car will fail to accelerate when merging and even stall out complete at any speed. Where is the recall?????.