Paying for Netflix through Vodacom is a Nightmare!!

Incredibly unhappy with the service from Vodacom. I am a 4GB Smart Data top up client which means I get data, minutes and smses on my package. I have been trying to sign in to Netflix and pay through my vodacom account from my airtime that I buy and load myself onto my balance. I keep getting a error when I complete the steps to manage my subscription on the vodacom website it keeps saying your order is being processed please return in 20 minutes. When I called the call centre they told me I cannot pay for Netflix with my airtime. Its not possible with vodacom. Then I contacted the Instagram account, I have sent through screen shots and proof of my contract and my bill to the vodacom Instagram account and the email address they gave me and they keep going around in circles telling me I cannot pay for Netflix with my allocated Airtime and I have told them a few times that my airtime is bought and not allocated and they ask me for proof, I don't have proof I don't keep receipts and smses... How can the people that work for vodacom not be able to tell that my airtime is bought and not part of my contract package? How is this possible. I have been going through this for days now and this keeps going around in circles. Can someone that knows what they are doing actually contact me to get this fixed? The website I am using is https://offers.vodafone.com/za/subscription/details/za-netflix-standalone I have also contacted Netflix and the problem is with Vodacom. I have been loyal vodacom client for close to 20 years and I'm honestly appalled by this crazy service...