Vodacom not responding to overbilling of 3G data

This is not the first time I have complained, but once again, I have disputed data charges for certain numbers over the last 2 months. At the time of writing, I received one phone call over 2 weeks ago with the comment that my mail would be responded to with a reference number. This has not happened. Several reminder e-mails have, only then receiving the same pathetic automated response requiring my account number and banking details. In all my mails, I have actually attached copies of the Vodacom billings. A typical stalling tactic by Vodacom - hence me soliciting transparency via Hello Peter.