Complete incompetence and terrible attitude from Vodacom SA

At the beginning of August Vodacom called to ask if they could migrate my cellphone contract. As I was on their top package and they had restructured their packages. I was to receive an extra gig of data a month a cheaper out of bundle charges. This was for a R100 extra a month. I agreed to the migration. Halfway throughout september my data ran out - no reason given why, especially as I was supposed to have double the data. After multiple attempts to recharge as usual I called he call center and the agent said they would recharge for me. Then two days later when I still didn't have my data I again phoned the call centre where I was told that I had been migrated to a top up plan and had to go to a shop to buy data. This was followed by a very long and difficult conversation where Arthur (the supervisor on duty) told me that it was impossible to migrate me to the correct plan, i.e. Correct the mistake that Vodacom had made. I was told the manager would phone me the next day, this never happened. It took two days for another call centre agent to call and say they were going to migrate me to the correct plan. Now in the new month I got an SMS saying I'm on the correct plan. But now they have cancelled my caller id and today I get a message that my insurance is cancelled. When I phone the call centre the agent tells me first there are no supervisors because they're in a meeting, then she says the policy has changed and they can't escalate to a supervisor. So despite being called out the inconsistencies in her story she refuses to escalate to a supervisor. She then says she's transferring me to an admin consultant and then drops the call. I'm am extremely frustrated and angry - I have spent far too much time on the phone trying to get Vodacom to correct mistakes they have made, something I did not expect to have to do when I pay for one of their premium packages. Disgusted.