Ball wont go faster

Hello unity newbie here. I have a problem with one of my scripts. I´m trying to make a simple pong game where the ball will go faster everytime it hits one of the players. But the ball only goes slower! Here is my script:

 using UnityEngine;
 using System.Collections;
 
 public class Ball : MonoBehaviour {
     public int ballSpeed;
     
     void Start () {
         rigidbody.AddForce(new Vector3(Random.Range(-100.0F, 100.0F), 0, 0) * ballSpeed * Time.deltaTime);
     }
     
     void OnCollisionEnter (Collision col)
     {
         if(col.gameObject.name == "Player01")
         {
             float X = Random.Range(-5.0F, -15.0F);
             float Y = Random.Range(6.0F, -6.0F);
             ballSpeed += 100;
             rigidbody.AddForce(new Vector3(X, Y, 0) * ballSpeed * Time.deltaTime);
         }
         else if(col.gameObject.name == "Player02")
         {
             float X = Random.Range(5.0F, 15.0F);
             float Y = Random.Range(6.0F, -6.0F);
             ballSpeed += 100;
             rigidbody.AddForce(new Vector3(X, Y, 0) * ballSpeed * Time.deltaTime);
         }
     }
 }