My Score doesn't add up

Apparently, my score is not working as it should be, but it's not working for some reason. for example the score doesn't add up whenever I defeat an enemy, does anyone know how to fix this?

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class Enemy : MonoBehaviour { public GameObject refToBase; public GameObject refToGameManager; public float moveSpeed; public string Enemystate; private Transform target; public Rigidbody2D RB; public BoxCollider2D BoxCollider2D; // Start is called before the first frame update void Start() { moveSpeed = 0.3f; target = GameObject.FindGameObjectWithTag("Threat").GetComponent(); RB = GetComponent(); BoxCollider2D = GetComponent(); }

 // Update is called once per frame
 void Update()
 {
     transform.position = Vector2.MoveTowards(transform.position, target.position, moveSpeed * Time.deltaTime);
      if (this.GetComponent<SpriteRenderer>().bounds.Intersects(refToBase.GetComponent<SpriteRenderer>().bounds))
      {
         refToBase.GetComponent<Base>().LifeNum -= 1;
      }
 }

public void OnTriggerEnter2D(Collider2D collision) {

     if (collision.gameObject.GetComponent<Base>() != null)
     {
         Death();
         refToBase.GetComponent<Base>().LifeNum -= 1;
     }
     if (collision.gameObject.tag == "Cannonball")
     {
         refToGameManager.GetComponent<GameManager>().ScoreCount += 10;
         Debug.Log(collision.gameObject.tag == "Cannonball");
     }
 }

 public void Death()
 {
     Destroy(this.gameObject);
 }

}

public class GameManager : MonoBehaviour { public bool gameHasEnded = false; public string gameState = "Play"; public bool isplayable = true; public GameObject refToBase, refToPlayer, refToEnemy, refToEnemy2, refToCannon, refToCannonball; public TextMesh ScoreText; public int ScoreCount = 0; // Start is called before the first frame update void Start() { ScoreText.GetComponent(); refToCannon = GameObject.Find("Cannon"); }

 // Update is called once per frame
 void Update()
 {
     ScoreText.text = "Score: " + ScoreCount.ToString();

     if (isplayable == true)
     {
         Time.timeScale = 1;
     }
     if (gameHasEnded == true)
     {
         gameState = "Stop";
         refToPlayer.GetComponent<Player>().PlayerState = "Stop";
         refToCannon.GetComponent<Cannon>().CannonState = "Stop";
         refToCannon.GetComponent<Cannon>().isplayable = false;
         isplayable = false;
         Time.timeScale = 0;

         if (Input.GetKey(KeyCode.R))
         {
             Restartgame();
         }
     }
     
 }
 void Restartgame()
 {
     SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
 }

}