Data overcharged

Vodacom is trying to rip me off, I have logged a call with their customer care division and it takes them days to respond back and when they do respond, they give generalised responses. I received a shocking bill that my data usage was over the allocated 3gigs. They have failed to let me know by how much was my data over by and to send me a detailed internet sessions. This is by far the worst of the worst service provider in the whole of Africa. They lack customer empathy and they seem to be after profits other than serving the same people who are putting food on their table. Disgusting!!!!!!