How do I prevent data repetition in mvc?

Hello there. I am drawing data from the database according to a certain condition. however, the query repeats data in some cases and lists duplicate data. How do I prevent this?

TekrarAraV View;

@model IEnumerable
@{
ViewBag.Title = "Tekrar Ara";
string userRols = ViewBag.userRoler;
int i = 1;
}
"/Rapor/TekrarAraV" method="get">
"text" name="date" id="date" class="form-control" />
"submit" value="Getir" />
"display:none;">@DateTime.UtcNow.AddHours(3).AddMinutes(5).ToString("dd/MM/yyy")

class="table">

"font-size:medium;padding-left:15px;">Ad

"font-size:medium;">Telefon

Mail

"font-size:medium;">Durum

"color:red;font-size:medium;width:20%;text-align:center;">

"font-size:medium;">Aranacak Tarih

"font-size:medium;">Notu

@if (userRols == "admin")

{

"font-size:medium;">Sorumlu TMK

}

@foreach (var item in Model)

{

"padding-left:20px;">

@item.flowName

@item.flowPhone

@item.flowEMail

@item.firstStatusText

"text-align:center;">

@Convert.ToDateTime(item.callDate).ToString("dd/MM/yyy")

"margin-left:10px;">@item.tekrarSaat

@item.notes

@if (userRols == "admin")

{

@item.tmkName

}

@Html.ActionLink("Çagri Aç", "Edit", "flows",new { id = item.flowId }, new { target = "_blank" })

i++;

}

RaporController;

public ActionResult TekrarAraV(DateTime? date)
{
userData = userControl(); ViewBag.uData = userData;
string userName = userData.tmkName;
using (smartCMSEntities ft = new smartCMSEntities())
{
string userRol = userData.role;
ViewBag.userRoler = userRol;
if (date == null && userRol == "admin")
{
return View(ft.vw_get_callLog.Where(x => x.firstStatusText == "Tekrar Ara" & x.callDate != null & x.callDate == DateTime.Today).ToList());
}
else if (date == null)
{
return View(ft.vw_get_callLog.Where(x => x.firstStatusText == "Tekrar Ara" & x.callDate != null & x.tmkName == userName & x.callDate == DateTime.Today).ToList());
}
else if (userRol == "admin")
{
return View(ft.vw_get_callLog.Where(x => x.firstStatusText == "Tekrar Ara" & x.callDate != null & x.callDate == date).ToList());
}
else
{
return View(ft.vw_get_callLog.Where(x => x.firstStatusText == "Tekrar Ara" & x.callDate != null & x.tmkName == userName & x.callDate == date).ToList());
}
}
}