Sounds to me that their "battery issue" was the start of their mess up. The battery might have needed a jump since it was sitting in the showroom. Sounds like they tried to jump the car with the + and - reversed. You can do serious damage to a car.
My buddy tried jumping his car awhile back using his mother's car as the jumper. He connected them backwards and car wouldn't turn over. Well a minute or so went by and then I began to smell some burning and then lots of smoke coming from the dash. Needless to say, most of the electronics inside the car wouldn't work.
Connecting the cables correctly minutes later the car started right up.....
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2010 40th Anniversary 370Z
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