Mvc index wont refresh after HTTP post

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MVC

Hello

I am self-teaching for a project so the problem might be fairly obvious.

I have a HTTP Post Method that is doing a database update.
On the event that there is an error, I want to return a view bag message to the Index page to populate a modal.
When I step through the code I can see the results are being passed ect but the Index page is not refreshing.

I have tried that many solutions I have lost count but this is the code I have at the moment. I also feel like im adding unnecessary steps now.
Some of it is hardcoded just now once i get this bit working im going to back and fix it.

Could someone please help?

What I have tried:

@if (ViewBag.ErrorMessage != null)
            {
                <div class="modal" tabindex="-1" role="dialog" id="errorModal">
                    <div class="modal-dialog" role="document">
                        <div class="modal-content panel-warning">
                            <div class="modal-header" style="background-color:#f797a2">
                                <h5 class="modal-title">@ViewBag.ErrorTitle</h5>
    
                            </div>
                            <div class="modal-body">
                                <p>@ViewBag.ErrorMessage</p>
                            </div>
                            <div class="modal-footer">
                                <button type="button" class="btn btn-danger" data-dismiss="modal">Close</button>
                            </div>
                        </div>
                    </div>
                </div>
            }

var document = {};
                document.DisplayName = row.find(".DisplayName").find("span").html();
                document.FileComment = row.find(".FileComment").find("span").html();
                document.Order = row.find(".Order").find("span").html();
                document.Direction = row.find(".Direction").find("span").html();
                document.FileDate = row.find(".FileDate").find("span").html();
                document.Id = row.find(".Id").find("span").html();
                //customer.Country = row.find(".Country").find("span").html();
                $.ajax({
                    type: "POST",
                    url: "/Home/UpdateRecord",
                    data: '{document:' + JSON.stringify(document) + '}',
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (response) {
                        if (!response.success) {
                            alert(JSON.stringify(document));
                            alert(document.DisplayName);
                            $.ajax({
                                type: 'POST',
                                dataType: 'JSON',
                                url: '/Home/SetViewData',
                                data: { errorTitle:response.errorTitle, errorMessage: response.errorMessage },
                            });
                        }
                    },
                });
            });

[HttpPost]
            public ActionResult UpdateRecord(ApplicationData_DocumentsModel document)
            {
                var record = _context.ApplicationData_Documents.Where(m => m.Id == document.Id).SingleOrDefault();
                if (record != null)
                {
                    try
                    {
                        _documentViewer.UpdateDocomentInfo(document);
                        ModelState.Clear();
                        return Json(new { success = true }, JsonRequestBehavior.AllowGet);
                        //return RedirectToAction("Index", new { year = record.Year, applicationRef = record.AppRef, type = record.Type, docRef = record.DocumentRef });
                    }
                    catch
                    {
                        ModelState.Clear();
                        return Json(new { success = false, errorTitle = "Unable to Update Record", errorMessage = "" }, JsonRequestBehavior.AllowGet);
                        //return View("Index", "Home", new { year = record.Year, applicationRef = record.AppRef, type = record.Type, docRef = record.DocumentRef });
                    }
    
                }
    
                ModelState.Clear();
                return Json(new { success = false, errorTitle = "Unable to Find Record", errorMessage = "" }, JsonRequestBehavior.AllowGet);
                //return View("Index", "Home", new { year = record.Year, applicationRef = record.AppRef, type = record.Type, docRef = record.DocumentRef });
            }

public ActionResult Index(string year, string applicationRef, string type, string docRef = null)
            {
                
                bool documentRefremce = _documentViewer.DocumentRefrence(type);
    
                string path = documentRefremce == true ? $@"C:\Applications\Documents\{year}\{applicationRef}\{type}\{docRef}" 
                    : $@"C:\Applications\Documents\{year}\{applicationRef}\{type}";
    
               
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
    
                var documents = _documentViewer.GetDocumentsForMember(applicationRef, year, type, docRef);
                if(documents.Count == 0)
                {
                    documents.Add(new ApplicationData_DocumentsModel { Year = year, AppRef = applicationRef, Type = type, DocumentRef = docRef});
                }
    
    
                ViewBag.ErrorTitle = TempData["ErrorTitle"];
                ViewBag.ErrorMessage = TempData["ErrorMessage"];
    
                return documentRefremce == true ? View("BasicView", documents) : View(documents);
       
            }

[HttpPost]
            public ActionResult SetViewData(string errorTitle, string errorMessage, string year = "2022", string appRef = "CLA708848977", string type = "Email", string documentRef = "") // hard coded for now
            {
                ViewBag.ErrorTitle = errorTitle;
                ViewBag.ErrorMessage = errorMessage;
                ModelState.Clear();
                return RedirectToAction("Index", new { year = year, applicationRef = appRef, type = type, docRef = documentRef });
            }