Vodacom's pathetic service

I contracted with Vodacom to upgrade to a home internet service in October 2023. Due to a comedy of errors by Vodacom the contract was not loaded. Eventually the contract was uploaded in January 2023. But now Vodacom claims that the price has changed. Of course I challenged that because Vodacom was in breach of contract. Eventually Reuben from their media team contacted me and offered to credit my account with the difference of R2400.00. That credit never materialised. I have tried every possible avenue to speak to someone about this outstanding credit. All I am getting is that the matter will be escalated and someone will call me. To date nothing. Their facebook team is absolutely useless. All they do is copy and paste generic responses. I have emailed customer service, where someone called who had absolutely no idea what he was doing. He did not read the comms history and it was completely a waste of time. Again, I got an email saying that he escalated the matter to his manager and she will call me. To date nothing. It is just insane to think that it is impossible to speak to anyone who can assist with a credit that has a reference number. Even the conversation with Reuben is on record. Vodacom here is the reference number again S5-RJ03W-W0KNA. How is it still possible for a big corporation like Vodacom to still exist with such pathetic, non-existent service delivery models?