I tell you, owning a modern BMW is not for the faint of heart.
The explanation does't make a lot of sense - I'd say try a different dealer, or ask your local BMWCCA chapter for advice on which dealer and SA to try.
2008 528i: Ti Silver/Black/Light Poplar Wood, ZPP, ZCW, STEP, Comfort Seat, Heated Rear Seat, PDC, Xenon, Nav, iPod. 35% ceramic tint. VentureShield Clear Bra.