Simple task proves to be too difficult for uncontactable Vodacom

I have multiple contract with Vodacom for many years. I asked for a simple change, to convert one of my lines to prepaid on a particular date. I called and I was advised this will happen automatically. This was not so, I was billed after that date and my account was debited. I called and logged another call for which the consultant apologized and mentioned this will be rectified. I also received a reply mentioning that I would get a response in 24 hours. This did not happen. My life got in the way and I forgot about it temporarily, but now the debit went off again right now @ 20:30, billing me for another month for a line that was supposed to be changed to prepaid 2 months ago. This is ridiculous as I cannot get to speak to anyone. Even when I call in and insert this number in question, the automated system mentioned the cancelling is in progress, goodbye. This is poor service from the provider. This is poor contact points to speak to a human. This is unnecessary calls, emails, time, waiting on hold, frustration on my part. Rate the service from 1 to 10, has to be 1 unfortunately