Arrogant Vodacom with their knee on our neck as their customers

It looks like Vodacom is so big that they do not care about their loyal customers anymore. They participate in twitter, customer care email and their 082 135 and as soon as their customer finishes to relate a query, they simply ignore us. I had a problem with them since the April 2020 invoice. I communicated to them and they kept on promising to escalate and get the matter resolved. To date, 09 June 2020 they are still not able to resolve the matter. The last correct invoice was in March 2020. I send them a copy of where they have erred. Initially it was a R4.52 mistake. Now they have made it worse. They have unilaterally changed my discount which they termed "Reduced Subscription Discount Proration of R135.65". They took it off and from my invoice of R403 they bumped it up to R559 per month. On 15/05/2020 someone send me a tweet saying that the discount will be loaded for the next 24 months. Nothing is done. Do they really care about their desperate customers reporting them to HelloPeter? I doubt. For them as long as money keeps coming in, they could not be bothered. In case they care, I have provided my account number