Worst place ever I pointed out the rear air was no...

Worst place ever I pointed out the rear air was not working day we purchased it, (5-19-12) they kept the cars for two days to put tires on it and go thru it. Two days later I took it back rear air did not work and half of the instrument panel does not work. Demetric Guy went in spoke to his boss they said they will fix it since it is a safety issue. Been try to get it scheduled and been getting the run around today 6-8-12 I am told it is not a safety issue by the used car director it is not a safety issue that not all cars are equip with a back up sensor so it is not necessary for it to be working