Double charged for roaming bundle when I only used 1 bundle and was away for a week

I purchased a 5GB+200minute roaming bundle when I was travelling last week. On my bill so far, I see that I have been double charged for the roaming bundle an amount of R1098 (double what the roaming bundle cost which is R549) I am long back from my trip overseas and when I look at my balances I see the 5GB roaming data is unused and the 200 minutes is also unused. Meaning that I was automatically charged on coming back home. This is really frustrating and don’t expect to be ****med by what I thought was a reputable company (Vodacom). When I call the call centre , there is nothing they can do for me until the invoice is released - which is next month. Yet the bundle expires on 20 July while I am in South Africa unable to use it. Really disappointed by the service I received regarding this matter.