Hey Ryan,
This really is a classic newbie question. Is it by any chance cold out when this white smoking happens?
If so, and we're just talking about when you first start up in the morning (i.e. cold engine start up) this is totally, completely, absolutely, utterly, manifestly NORMAL behavior. Using a fuel additive and/or some biodiesel will reduce it.
If this is all we're talking about, the dealer has some serious explaining to do - like why they tried to 'fix' completely normal behavior.
Welcome to the club. (please read the FAQ in this section)
~BeetleGo