Hi,
I'm new here myself.
I believe that the auto dipping mirrors on reverse only come if you have the memory seats/mirrors as an option fitted to your car.
I think, from reading elsewhere, that since they added the Incontrol Pro version to all models that there is no hard drive option.
Others will hopefully confirm this though its only what I have read elsewhere.
Pity your dealer does not know, sometimes their lack of knowledge on some things is quite astonishing.
Cheers