Sounds like another dealer that at least made an effort to "make it right", was that the Langley dealership you dealt with?
Obviously lying to you about allocation in an attempt to lock you in with a deposit is not cool, and lots of dealers do it, I have my suspicions about that with my dealer, Carter GM in Burnaby, but have not been able to prove it.
Although my salesman at Carter promised over and over again (in writing as well as verbally) that they would help me out and minimize any difference from my original 2014 order to the 2015 that I was forced to move to when they couldn't produce my 2014 allocation, they did nothing for me. In the end I only got the gm "price protection" of $1400 but ZERO from the dealership. Carter would not give me even one cent off, and treated me very poorly to boot... Do Not deal with Carter GM!
Price difference for my Z51 from original order was $14,000, but i was forced to change colour as Cyber grey was discontinued, so I also made an interior colour change that bumped me up to 3LT from 2LT so that is on me, the difference in 2014 would have been approx. $4,500 and I don't mind paying an extra $500 for the 8 speed. In the end I consider my difference to be around $9,000 although you could argue that I got some extras thrown in through re-packaging of options even though I did not order these items (dealer didn't even know about it at time of order) so real "damage" would be a couple of grand less. With zero assistance from Carter it was a hard pill to swallow, I felt like walking away from the deal, but life is short and the car is still an amazing performance bargin. The bad taste in my mouth is slowly fading away but I will never deal with Carter GM ever again and will tell anyone who will listen to stay away too.
We as consumers should do what we can to warn each other about the bad dealers and tout the dealers that are reputable and are trying to do the right thing, in a bad environment. When I approached the Langley dealership they flat out told me that they did not have a 2014 allocation left. The people i dealt with there were honest with me. It may come down to individuals sometimes, although honesty should come from the top down in any dealership.
Like i said before, life is short, so have fun with your cars everyone!