Scaling a rotated object in global Y

In my game I am having a bouncing ball over platforms / sidescroller, and during it's bounces it rotates as it's having a rigidbody, with bounce material.

Now I want to build with a raycasthit, that if the ball bounces onto something underneath it, that it is going to squish, or be scaled alittle done in 1 axes. If the ball's local Y is similar to the global Y, this is no problem and is working perfectly, though when the ball rotates around it's axes I want the ball still to be scaled in global Y coordinates, no matter how it is being rotated. Does anyone have any idea how to fix this, or a workaround?

 using UnityEngine;
 using System.Collections;
 
 public class raycasthit : MonoBehaviour {
     RaycastHit  hit = new  RaycastHit();
     Vector3 dir;
     public float distance = 3;
     public float scaleTo = 0.90f;
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         dir = new Vector3(0,-1,0);
 
         Debug.DrawRay(transform.position,dir*distance,Color.green);
 
         
         if(Physics.Raycast(transform.position,dir,out hit,distance)){
             transform.localScale = new Vector3(scaleTo, scaleTo, scaleTo);
         }
         else{
             transform.localScale = new Vector3(1f, 1f, 1f);
         }
     }
 }

Thanks in advance!