Disappearing Airtime Acts

I did a software update on my iPhone 5S and suddenly I had lost R30 worth of airtime. I uploaded R50 and it was gone by the time I checked my balance. I uploaded R110 and bought 100MB of data and turned off my cellular data, after 10 minutes I didn't have a cent left. I called customer care and they told me I have to go to the repairs shop because they can't help me. When I went to the Vodacom repairs shop, they told me to call customer care. After explaining that I had spent the whole afternoon calling customer care, he then said to me \The update is faulty. We can't help you. You just have to wait."I had to purchase a new cellphone because of this and I have lost almost R300 worth of airtime and data. I am very furious because I'm a student"