Try contacting another dealership.  Some don't want to fix problems under warranty as it pays less than regular service work.  To be totally honest, if the steering wheel controls were not meant to work, that's about the dumbest thing I've ever heard.  Steering wheel volume controls were put there FOR safety, so you don't have to look away or move your hands from the wheel to increase/decrease volume.  To make it so that they don't work while driving would defeat the whole purpose.  I'd definitely be calling another dealer or the Mercedes Customer Satisfaction line on this one.

I agree.  That was the stupidest thing I've ever heard.  I would call Mercedes and tell them what the dealer told you.  Why would the things be there if they weren't functional?

Thank you for the advice.. I am going to pick the truck up in the morning and am armed with 5 articles stating that it was a standard feature on the 07 g55 to have audio control on the steering wheel.  I am interested at what their response will be.  Regardless, I will be switching dealerships.