Where's my data?

I am extremely unhappy with Vodacom lately. Firstly their data rates are so high in comparison with other service providers. Secondly this morning I received a message that I am running out of data, I immediately bought 10GB of data and received a message stating that my data will be loaded shortly. I received a message at 13:45 stating that I have used out-of-bundle data for my number. Where the hell is the 10GB I loaded in the morning? Why hasn't it been loaded? So I have loaded another 10GB when I received the message and still nothing! I refuse to be billed for the out-of-bundle data as I have now loaded 20GB and it is still nowhere to be found? We have been with Vodacom since 2000 and this is absolutely absurd!