Unresolved query and empty promises from Vodacom

I've had an unresolved query with Vodacom since August. They changed my account from a top up plan to open calls without me agreeing to it. Now my account is a big mess and they just keep playing delay tactics with me without resolving my matter. I have been in contact with their customer services since August already to try and reslove this, but they keep making empty promises like "your matter will be resolved or finalised in 7 working days, 48 hours" and absolutely nothing happened after that and I get no feedbacks and not even a simple update. I have been a loyal customer to this network for so many years but their customer service is really dissappointing.