Player Car Runtime Scaling Issue

I have a car as my main player and as you destroy other cars, your car size gets increased during gameplay so you become stronger to destroy other enemy cars.

Now when I scale up runtime player car, it started giving me t$$anonymous$$s kind of problem: As the car scale increased, the car started going inside the ground, above image represented t$$anonymous$$s point clearly. Now what to do for the solution? So the car does not get inside the ground.