Why can't I run a controller through AJAX code? [closed]

I have the following form in a modal:

<div class="modal fade" id="absenceModal" role="dialog" aria-hidden="true">
  <div class="modal-dialog modal-md" role="document">

    <form role="form" method="post" id="formAbsence">
      <div class="modal-content">

        <div class="modal-header">
          <h4 class="modal-title"><b>Absence</b></h4>
          <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        </div>

        <div class="modal-body">
          <div class="form-row">
            <div class="col-md-5 mb-3">
              <input class="form-control" type="text" name="date" id="date" readonly>
              <input class="form-control" type="number" name="no_empleado" id="no_empleado" readonly>
            </div>
          </div>
        </div>
        
        <div class="modal-footer">
          <button type="button" class="btn btn-secondary back-to-first-modal">BACK</button>
          <button type="submit" class="btn btn-primary">POST</button>
        </div>

      </div>
      
    </form>
  </div>
</div>

I have this JavaScript code:

$('#formAbsence').submit(function(event) 
{
  event.preventDefault();
  
  //var formData = $(this).serialize();


  var date = $('#date').val(); 
  var no_empleado = $('#no_empleado').val(); 
  
  $.ajax(
  {
    type: 'POST',
    url: 'controller/absence.controller.php',
    data: 
    {
      action: 'create',
      date: date, 
      no_empleado: no_empleado
    },
    success: function(response) 
    {
      alert(response);
      $('#absenceModal').modal('hide');
    }
  });
});

And this is my file "absence.controller.php":

<?php

class AbsenceController
{

    static public function data()
    {
        $resp = array();

        if ($_SERVER["REQUEST_METHOD"] == "POST") 
        {
            if (isset($_POST["action"]) && $_POST["action"] == "create") 
            {
                $resp = self::ctrCreate();
            }
            else 
            {
                $resp["error"] = "Nope.";
            }
        }
        else
        {
            $resp["error"] = "Not valid.";
        }

        echo json_encode($resp);
    }

    static public function ctrCreate()
    {
        $resp = array();

        if (isset($_POST["date"]) && isset($_POST["no_empleado"])) 
        {
            $date = $_POST["date"];
            $no_empleado = $_POST["no_empleado"];
            $reg = date("Y-m-d H:i:s");
            $num = 1;

            $conn = new mysqli("localhost", "bd", "1234", "bd_abscence");

            $sql = "INSERT INTO abscence (date, no_empleado, reg, capt) VALUES ('$date', '$no_empleado','$reg', '$num')";
            } 
            else 
            {
                $resp["error"] = "Error." . $conn->error;
            }

            $conn->close();
        }

        echo json_encode($resp);
    }
}

AbsenceController::data();

?>

This way everything works correctly. The insertion into the database is executed without problem. The problem comes when I want to give the code a more oriented approach to the MVC pattern. My file "absence.controller.php" would look like this:

<?php

require_once 'model/absence.model.php';

class AbsenceController
{
    static public function data()
    {
        $resp = array();

        if ($_SERVER["REQUEST_METHOD"] == "POST") 
        {
            if (isset($_POST["action"]) && $_POST["action"] == "create") 
            {
                $date = $_POST["date"];
                $no_empleado = $_POST["no_empleado"];
                $resp = AbsenceModel::createAbsence($date, $no_empleado);
            }
            else 
            {
                $resp["error"] = "Nope.";
            }
        }
        else
        {
            $resp["error"] = "Not valid.";
        }

        echo json_encode($resp);
    }
}

AbsenceController::data();

?>

And my file "absence.model.php" would look like this:

<?php

class AbsenceModel
{
    public static function createAbsence($date, $no_empleado)
    {
        $resp = array();

        $reg = date("Y-m-d H:i:s");
        $num = 1;

        $conn = new mysqli("localhost", "bd", "1234", "bd_abscence");

        $sql = "INSERT INTO absence (date, no_empleado, reg, capt) VALUES ('$date', '$no_empleado','$reg', '$num')";


        // Cerrar la conexión a la base de datos
        $conexion->close();
        
        return $respuesta;
    }
}

?>

When trying with the MVC approach, it doesn't work. What am I doing wrong?

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