Is there any way I can find an old ad that was once listed?

We purchased a vehicle a couple of months ago that our dealer used to
advertise on this website.  My husband and I spent over two months
deciding on the make and model of a vehicle that would accommodate our
biological children as well as our foster children. We decided that a Chevy
Express was the route we wanted to go. We shopped all over looking for
that very make and model. Shamrock Auto listed this vehicle as a 2012
Chevy Express w/ 7,000 miles. They told us that it was even still under
Chevy factory warranty. Only to discover that it's not a Chevy at all so all
warranty is null and void.  It has the body of a Chevy but inside it's a Via.
What the heck is a Via??!  We don't want a Via. We never want a Via. It is
now having serious problems with the drive train at only 9,000 miles and
we are stuck eating the cost.  Shamrock Auto falsely advertised and we
need to track down the original ad to prove it. Someone please help!