Glowing cars

I brought my son the glow car and track race on Thursday 18 April, before i left the mall the wheel already gotton off. I took it back to the store got a new one. The very same day in the evening the new car, same story the wheel got off. So i would like to find out the quailty of these cars. I am disappointed. Same thing do you people use cheap materail so that u want to make money from parents. Two cars same problem in one day.