Vodacom really messes up and cannot fix their own systems

Hi some weeks ago I had a major issue with Vodacom auto purchasing data on my number when the data is about to run out. It took weeks for them to fix this and it's been fine until suddenly today I received a message stating that I had a certain amount of data left and that they would auto purchase 1GB when it runs out. This is ridiculous! It was sorted out but now rears its head again. Vodacom need to get their house in order.