Contract breach and ******* billing

I had promo data when I signed my contract. About 4 months back I stopped seeing my promo data. Even using the Web, app or USSD codes, I still can't see it. The call centre say they see it on their side but I can't. And now after my normal data is exhausted I'm now incurring additional costs instead of using my promo data. Hence Vodacom is in breach of contract with regards to additional data and also now billing be illlegaly. Vodacom,how many times must a customer try to resolve your own issues?