using forms in APIView to send post request in django

[Arya]

i'm making an OTP app using class based views. the bottom is the class for generating and sending OTP to a phone number. the template works good and when i press the submit button in my html form it sends a post request and it returns response: 'phone number is not given in post req' so the template and API works! but the {{form}} in the html template doesn't work so i can't send the OTP to the number submitted in the form.

so what am i doing wrong? forms.py exists in my project with 1 field

class ValidatePhoneSendOTP(APIView,TemplateView):
    template_name = 'accs/reg.html'
    def post(self, request, *args, **kwargs):
        form = PhoneRegForm(request.POST)
        phone_number = request.data.get('phone')
        if phone_number:
            phone =  str(phone_number)
            user = User.objects.filter(phone_number__iexact = phone)
            if user.exists():
                return Response({
                    'status': False,
                    'detail': 'user exists'
                })

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        else:
            return Response({
                'status' : False,
                'detail' : 'phone number is not given in post req'


            })

i tried to pass FormView in the class after the APIView,TemplateView but i couldn't get that to work.

what am i doing wrong?