Charged for bundle I did not purchase

Each month I purchase a gig of data. Last month, I dialed *111# to purchase my data however the system timed out before I could purchase it. I reached the screen where it gives you the option to choose the data bundle however before I could enter in my preferred bundle, the system timed out and I had to start again. Before I could, I received an SMS stating the data had been loaded despite me not choosing any option. Being a new user, I am not very fami**** with all the Vodacom jargon and assumed all was in order. When I checked my statement, I saw the purchase went off my account and not my airtime. I called through to the call centre for two queries, Vuyo was extremely rude and the call cut. She brought in her Team Leader, Elsabe who simply could not care less. She said it was impossible for the purchase to be made ‘automatically’, that I was at fault and that there is no point in escalating the matter because I chose the option which was confirmed by back office. I asked her how is it possible that the data was loaded when I did not choose the option, which she responded in asking how the data was loaded when I say I did not choose the option. The exact question I have been asking. The consultants were extremely rude and insisted I was at fault when I am not.