DATA USAGE BILLING NIGHTMARE

My iphone 4s was accidentally put in lost mode and I could not access the phone. I had no option but to update and restore the phone.I started the download process at 2.30pm by installing itunes on my pc and I plugged in the iphone on my pc. I kept an eye on the data usage and during the installation I could see the data running out. I purchased 500mb data online and got a confirmation sms. The data didn't update immediately while the downloads were in progress. The ios update and restore of iphone continued on the itunes website and I again purchased 250mb at around 4.15pm. I could not see the data usage and there was no indication how much data was used. The update successfully completed and when I checked my account ***) my account was R2731. I kept on checking the account and noticed that the purchased bundles of 750mb never reflected. Only after 8pm did the bundles reflect. I was now charged R2500 out of bundle. I don't understand why this happened because I purchased data in time. I was charged R2 per mb instead of 5c. I would like to be refunded the difference as this was a fault from Vodacom's side not updating the data purchases in time.