Out of bundle rates after buying 5GIG

This is so pathetic I do not even know where to start...<br> <br> I bought a 5Gig data bundle on the 03/05/2015 round about 16h00 through the Vodacom app. The app told me that the purchase was successful. I started to download immediately about 1.5Gig. The next day I saw that I was charged out of bundle rates. When I phoned Vodacom to assist and demanded to speak to a manager and then was handed over to Lebogang. He told me that I have bought the 5Gig on 03/05/2015 at 16h00 but that the data download was done in the morning of the 3rd at 6AM. I told him it was impossible and the more I told him that and tel him what actually happened the more he told me that the Vodacom system does not make faults and through that actually initiate that I am a ****. The problem I have is that the system of Vodacom is showing different time off events of that what actually happened and I have my wife to confirm this. Now I am out of pocket with R 789.28. Still sit with a 5gig Data bundle that I do not need anymore that cost R 399. The problem is I wonder with how many client sof Vodacom this happens with where the system record wrongly and charge clients wrong. I do not know what i can do...ending contract?