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I believe in the other thread there was a TSB mentioned that may help you out.
had the same thing happen to my escalade, it was strapped down very tight on a car carrier(was there when it arrived) and key was turned on while cinched down, killed both struts as the electronic was stuck in ultra firm and like you said undrivable. I talked to a friend at GM and was told sometimes some stick if they hang on a lift for a couple of days, or can be killed as mine were being strapped down, was yours towed ?
If you havebthem replace the shocks. Definitely ask for the parts back. Then I would take them to the dealer and have them inspected to see if this shop is screwing with you or not about them being blown.
Something sounds fishy.