auto purchase

Purchased a truck for my son. it had bald tires so I asked them to change tires and do alignment and inspection. When we came back, it had used tires on it and had been inspected. After truck was pickuped, it went thru two sets of tires fast and son got in bad accident because of break failure. Nice people but not to sure if an actual inspection was done or an alignment. Break lines I were told were bad and should have been noticed on inspection. Now i am paying $4000 for nothing.