custom create user and profile with @Reciver

(view)formprofileanduser.py

def crearempresa(request):
    field_ejecutivo = Profile.objects.filter(tipo_usuario='ejecutivo')
    if request.method == 'POST':
        user_form = UserEmpresaForm(data=request.POST or None)
        if user_form.is_valid():
            user = user_form.save()
            user.refresh_from_db()
            user.profile.rfc = user_form.cleaned_data.get('rfc')
            user.profile.tipo_usuario = 'empresa'
            user.profile.formato = user_form.cleaned_data.get('formato')
            user.profile.servicios = user_form.cleaned_data.get('servicios')
            user.profile.ejecutivo_decuenta = request.POST['ejecutivo']
            user.save()
            messages.success(request, 'creado con exito')
    else:
        user_form = UserEmpresaForm()

    return render(request, 'creacionedicionusuarios/crear_empresa.html', {'user_form':user_form, 'field_ejecutivo':field_ejecutivo })

create_empresa.html

    <div class="overflow">
        <h1>Crear Empresa</h1>
        <form  method="post">
            {% csrf_token %}
                        <select name="ejecutivo" id="" class="form-control">
                {% for foo in field_ejecutivo %}
                    <option value="{{ foo.user  }}">{{ foo.user }}</option>
                {% endfor %}
            </select>
            {{ user_form }}

            {{ user_form.errors }}

            <input type="submit" value="Crear+">
        </form>
    </div>

forms.py

from django import forms
from django.conf import settings
from django.contrib.auth import authenticate
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from .models import Profile


class UserEmpresaForm(UserCreationForm):
    rfc = forms.CharField(max_length=20)
    formato = forms.ChoiceField(choices=FORMATOS_CHOICES,  label="", initial='', widget=forms.Select())
    tel_movil = forms.CharField(max_length=20)
    servicios = forms.ChoiceField(choices=SERVICIOS_CHOICES,  label="", initial='', widget=forms.Select())
    class Meta:
        model = User
        fields = ('username', 'email')

    def __init__(self, *args, **kwargs):
        super(UserEmpresaForm, self).__init__(*args, **kwargs)
        self.fields['username'].widget.attrs.update({'class': 'form-control'})
        self.fields['email'].widget.attrs.update({'class': 'form-control'})
        self.fields['rfc'].widget.attrs.update({'class': 'form-control'})
        self.fields['formato'].widget.attrs.update({'class': 'form-control'})
        self.fields['servicios'].widget.attrs.update({'class': 'form-control'})
        self.fields['tel_movil'].widget.attrs.update({'class': 'form-control'})

model.py

from django.contrib.auth.models import AbstractUser, User
from django.dispatch import receiver
from django.db.models.signals import post_save

class Profile(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL)
    tipo_usuario = models.CharField(max_length=10, choices=TIPO_USUARIO_CHOICE)
    rfc = models.CharField(max_length=20, blank=True, null=True)
    ext = models.SmallIntegerField(blank=True, null=True)
    correo_i = models.EmailField(blank=True, null=True)
    tel_casa = models.CharField(max_length=15, blank=True, null=True)
    tel_movil = models.CharField(max_length=15, blank=True, null=True)
    dias_descanso = models.CharField( max_length=2 ,choices=DIAS_DESCANSO, blank=True, null=True)
    estacion_trabajo = models.CharField( 'Estación Trabajo' ,max_length=15 , blank=True, null=True)
    tipo_sangre = models.CharField(max_length=3, blank=True, null=True )
    telefono_emergencia = models.CharField(max_length=15, blank=True, null=True)
    nombre_familiar = models.CharField(max_length=50, blank=True, null=True)
    parentesco = models.CharField(max_length=10, blank=True, null=True)
    fecha_nacimiento = models.DateField( blank=True, null=True)
    # for panel personal
    ejecutivo_decuenta = models.CharField( max_length=30,blank=True, null=True)
    formato = models.CharField(max_length=20, choices=FORMATOS_CHOICES, blank=True, null=True )
    servicios = models.CharField(max_length=20, choices=SERVICIOS_CHOICES, blank=True, null=True)

    def __str__(self):
        return self.user.username


@receiver(post_save, sender=User)
def update_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)
    instance.profile.save()