when deleting record from DB the page cannot be rediirected using AJAX

Code:

View
******
<td align="center">
<a href="<?php echo base_url().'Users/deleteFile/'.$row['markid']; ?>" onclick="return confirm('Are you sure to delete data?')"  name="idv"  <i class="fa fa-remove" style="font-size:25px;color:red"></i>
</td>

Code:

Controller
**********
public function deleteFile($markid)
 {
     if ($this->User_Model->delete_file($markid))
     {
         $status = 'success';
         $msg = 'File successfully deleted';
         redirect('Users/upload');
         
     }
     else
     {
         $status = 'error';
         $msg = 'Something went wrong when deleting the file, please try again';
     }
     echo json_encode(array('status' => $status, 'msg' => $msg));
     //redirect('Users/upload','refresh');
   
 }

Code:

Model
*******
public function delete_file ($markid){
       $this->db->where('certid', $markid);
       $this->db->delete('gallery');
       if ($this->db->affected_rows() == '1')
   {
     return TRUE;
   }
   
   return FALSE;        
   }

the records are successfuly deleted, but the page cannot redirect it goes to dashboard. any alternate option suggestion please.