Data issue - call center not very helpful

I had a data issue on Sunday, I had just loaded a 250mb bundle on the Friday and my average usage is between 10-40mbs per day.<br> <br> I checked my balance Sunday morning and had 200mbs remaining. I was on my home wifi the entire day other than two quick trips out of the house.<br> <br> I then check my balance on Monday morning and it was 0mbs.<br> <br> I am not saying that the data was not used but it is well above my daily usage and I was on the wifi so wanted to understand what happened. My auto updates are set to wifi only as well.<br> <br> I called the call center on Monday morning and had a convo with Gregory, who basically gave me a half an hour of run around. First he said it was auto updates, I went and checked and it wasn't, he then said that even on wifi, data can be used. I find this hard to believe because then what is the point of switching on wifi?<br> <br> Ultimately he was unwilling to listen to my complain and told me to go to a store, what would they do at the store exactly Vodacom?<br> <br> I have just switched to prepaid and was about to set up bundles for the year, struggling to see why I should stay loyal to Vodacom with service like this?