Can't put data into tuple in forms.py Django

I'm currently getting the data from an external API (also developed with django) and put it into a tuple and it's showing it in the HTML but when i use that info into a form and post it, it always shows that field has "none"

(Views.py)

def register_user(request):
        
    if request.method == "POST":
        if "register" in request.POST:
            mainForm = mainUserForm(request.POST)
            form = userForm(request.POST)
            
            if mainForm.is_valid() and form.is_valid():
                 
                user = User.objects.create_user(mainForm.cleaned_data['username'],mainForm.cleaned_data['email'],mainForm.cleaned_data['password'])
                if form.cleaned_data['userType'] == 2:
                    user.is_superuser = True
                    user.is_staff = True
                user.save()
                
                userextended = models.commonUserModel(user = user, firstName = form.cleaned_data['firstName'], lastName = form.cleaned_data['lastName'], 
                phoneNumber = form.cleaned_data['phoneNumber'], rut = form.cleaned_data['rut'], 
                userType = form.cleaned_data['userType'], company = form.cleaned_data['company'])
                userextended.save()
                            
                return redirect('registerUser')
            else:
                
                return redirect('registerUser')
    

    context = {}
    context['mainForm'] = mainUserForm
    context['form'] = userForm()
    

    context['userExtend'] = commonUserModel.getUserExtended(request.user.id)
    return render(request, template_name='auth/register.html', context= context)

(Models.py)

class commonUserModel(models.Model):
    user = models.OneToOneField(User, on_delete = models.CASCADE, related_name="extend")
    company = models.IntegerField()
    firstName = models.CharField(max_length=30)
    lastName = models.CharField(max_length=30)
    phoneNumber = models.CharField(max_length=20)
    rut = models.CharField(max_length=20, unique= True)
    userType = models.IntegerField(choices=CLIENT_TYPES, default=1)
    disabled = models.BooleanField(default = False)

(Forms.py)

class userForm(forms.ModelForm):
    
    def __init__(self,company_choices, *args, **kwargs):
            choices=[]
            super(userForm, self).__init__(*args, **kwargs)
            self.fields['testeo']=forms.ChoiceField(choices=((0, 'Normal' ),
                (1, 'Especial'),))             
                  
    testeo= forms.ChoiceField()
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