Discussion Cannot Change the Size of the Hole in Mesh with Scripting

Hello Everyone, I am making the Game about Hole,

The Game Contains Hole in the Mesh and the Object fall from it. Like Hole.io game.
I have achieved that moving the Hole in the Mesh by the Vertices and the Hole is Relocating or Moving according to My Desire.
I am Moving the Hole By getting the vertices of the Hole in Mesh and then Move or relocate it in the Script given Below.
There are 2 Issue's About which I need help.

1- I cannot make the Hole Bigger or Smaller by the vertices of the Hole in mesh.
2- I cannot add more vertices in the Hole of the mesh.

Is there Anyone Who can help the Image and the Code for the mesh is Given Below

Image:

Code (CSharp):

1.  
2. public MeshFilter meshFilter;
3.  
4.     public MeshCollider meshCollider;
5.  
6.     public Vector2 moveLimits;
7.  
8.     //Hole vertices radius from the hole's center
9.     public float radius;
10.  
11.     public Transform holeCenter;
12.     public Transform rotatingCircle;
13.  
14.     public float moveSpeed;
15.  
16.     Mesh mesh;
17.     List<int> holeVertices;
18.     //hole vertices offsets from hole center
19.     List<Vector3> offsets;
20.     int holeVerticesCount;
21.  
22.     float x, y;
23.     Vector3 touch,
24.     targetPos;
25.  
26.  
27.     void Start()
28.     {
29.         RotateCircleAnim();
30.  
31.         //Initializing lists
32.         holeVertices = new List<int>();
33.         offsets = new List<Vector3>();
34.  
35.         //get the meshFilter's mesh
36.         mesh = meshFilter.mesh;
37.  
38.         //Find Hole vertices on the mesh
39.         FindHoleVertices();
40.     }
41.  
42.     void RotateCircleAnim()
43.     {
44.         rotatingCircle.DORotate(new Vector3(90f, 0f, -90f), .2f).SetEase(Ease.Linear).From(new Vector3(90f, 0f, 0f)).SetLoops(-1, LoopType.Incremental);
45.     }
46.  
47.     void Update()
48.     {
49.         MoveHole();
50.         //Update hole vertices
51.         UpdateHoleVerticesPosition();
52.  
53.     }
54.  
55.     void MoveHole()
56.     {
57.         x = Input.GetAxis("Mouse X");
58.         y = Input.GetAxis("Mouse Y");
59.  
60.         //lerp (smooth) movement
61.         touch = Vector3.Lerp(holeCenter.position, holeCenter.position + new Vector3(x, 0f, y), moveSpeed * Time.deltaTime);
62.  
63.         targetPos = new Vector3(Mathf.Clamp(touch.x, -moveLimits.x, moveLimits.x), touch.y, Mathf.Clamp(touch.z, -moveLimits.y, moveLimits.y));
64.  
65.         holeCenter.position = targetPos;
66.     }
67.  
68.     void UpdateHoleVerticesPosition()
69.     {
70.         //FindHoleVertices();
71.         //Move hole vertices
72.         Vector3[] vertices = mesh.vertices;
73.  
74.         for (int i = 0; i < holeVerticesCount; i++)
75.         {
76.             vertices[holeVertices] = holeCenter.position + offsets;
77.         }
78.  
79.         //update mesh vertices
80.         mesh.vertices = vertices;
81.         //update meshFilter's mesh
82.         meshFilter.mesh = mesh;
83.         //update collider
84.         meshCollider.sharedMesh = mesh;
85.     }
86.  
87.     void FindHoleVertices()
88.     {
89.         for (int i = 0; i < mesh.vertices.Length; i++)
90.         {
91.             //Calculate distance between holeCenter & each Vertex
92.  
93.             float distance = Vector3.Distance(holeCenter.position, mesh.vertices);
94.        
95.             if (distance < radius)
96.             {
97.                 //this vertex belongs to the Hole
98.                 holeVertices.Add(i);
99.                 //offset: how far the Vertex from the HoleCenter
100.                 offsets.Add(mesh.vertices - holeCenter.position);
101.             }
102.         }
103.  
104.         //save hole vertices count
105.         holeVerticesCount = holeVertices.Count;
106.     }
107.  
108.  
109.     //Visualize Hole vertices Radius in the Scene view
110.     void OnDrawGizmos()
111.     {
112.         Gizmos.color = Color.yellow;
113.         Gizmos.DrawWireSphere(holeCenter.position, radius);
114.     }
115.  

 

Ok I will make sure to Do it Properly But Will you tell me How I can solve my issue's Thanks.