I don't think it's worth it anymore.
Who knows what electrical systems could have been damaged by reverse polarity. Could cause electrical gremlins that won't show up until later... plus shows the dealer was lying to you or withholding information the whole time... do you really trust them still?

 

I think it depends on how much work the Infiniti dealership did. If they did an electrical system overhaul its still worth it. I honestly don't think the dealership was withholding that information, I think they didn't know and made up a b.s. story that they thought would sound good (have you met any car dealers that WOULDN'T do that?).

I'm waiting on the scans of the receipt from Infiniti so I can call the dealership to double check on the work and I will ask if this could cause any future problems.