Vodacom incorrect informtion and Overcharging

I. On 23 June I purchased 2 x 500meg of data for R100 after my App showed me that I had no data balance when I actually had over 1gig of data. II. The email confirmation sent by Vodacom (attached) informs me that I purchased 500meg for R100 when in fact I purchased 2 x 500meg for R100. In my March account Vodacom under the same circumstances charged me +_R200 for the 2 x 500meg purchased for R100. Had I not been observant the charge would have gone unnoticed as I am sure is happening with thousands of clients I requested Vodacom to address this situation and then have not done so. Be careful when dealing with Vodacom and check your Invoice and statements as I have no doubt thousands of unknowing clients unknowingly have the same problem A disgraceful and questionable business practice