2005 GMC CANYON User Comment / Complaint

I have a 2005 gmc canyon 4wd cc p/u . this p/u was purchased new in may 2005. the window sticker clearly lists an auto locking differential under standard equipment. in november 2005 gmc sent a letter to me which stated that this vehicle does not have a auto locking differential. as of this date (2-2-06) gmc admits that the window sticker is wrong, but other options were added to make up the difference. i don't know how this could have been done. gmc also is not willing to do anything to correct this mistake made by them.