Interior Rearview Mirror problems of the 2009 Toyota Corolla

2009 Toyota Corolla le driver's side rearview mirror has significant distortion and does not present a clear view of the road behind. Very difficult, especially at night, to judge where vehicles are. Mirror appears to be slightly concave. Called dealership, was told this was an intentional "magnification" feature. Per 49 cfr 571. 111, drivers side mirrors on cars sold in the us must have unit magnification, I. E. They must be flat. I cannot find any exemption for Toyota. Dealership claims it is impossible to repair this problem.