Paradise Auto sales Paradise Lube and Oil, Paradise Auto center Ripped off my under age son illegaly grants pass Oregon

My under age son went to there lot and bought a car, some how later found out they wrought a contract between him and credit union which is illegal due to he is under age 18 and can not be in binding contract, but thru credit union we found out the person at lot changed his birthdate to get it done, well of course we called credit union because paradise refused to undo deal even though they knew illegal and wrong on there part, his liscense clearly shows birthdate so he did not lie they even had copie of it, well credit union made them unwind but my son had put money into car, wheels and stereo and such, they said well made the car not worth any more and refused to reimburse him which is wrong, and also as far as made it worth less, the car was back on there lot advertise for more and the additions noted on car as special feture why its worth more, these guys are pro scam artist and will take advantage of your children. beware, plus the car had mechanical issue my son had fixed.