Overcharged and no response to emails

Over the weekend I added another 250meg bundle to my account. This was never added but the bundle amount was added to my account. I then requested another bundle and the same thing happened. After emailing vodacom, a bundle was activated. I have still been billed for the 2 bundles but have only received 1 not to mention the data usage I was billed for while waiting for the bundles to activate. I have now sent 2 emails to customer services about this and am still waiting for a response. I would like this rectified immediately.