Incorrect charges for data not used

I have upgraded my contract towards the end of Jul 2017. I went to the Vodacom shop in Somerset Mall on 29 Jul 2017 to set up my new phone and transfer all relevant information at a fee of R300. In August I discovered that data was charged towards my account which was not supposed to. I queried it at the Vodacom shop in Somerset West Main Road and was advised that it was due to a photo back up and they have changed the setting. I received an account due for payment on 30 Sep of R1, 277.70. My account is NEVER more than R300 because I hardly ever use data. My cell is most of the time linked to WIFI. The data amount was R859.84 + VAT = R980.22. I deducted this amount and paid the difference of R297.48. I contacted Vodacom call centre on 16 Oct +/- 15:55 and the technician guided me through the steps to check the settings. He couldn’t assist and transferred me to a different department. I spoke to Dumelak and he advised me that this data was used and I can’t blame them if the phone settings were the reason for the usage because it isn’t Vodacom’s fault. I haven’t touched any settings! My phone was set up by a Vodacom technician at a Vodacom shop and I paid for this service. I’ve checked my account again and my account is again adding up on data that I haven’t used which means I will have the same problem again towards the end of this month. Since my upgrade I was at the Vodacom shop in Somerset Mall twice and once at Main Road Somerset West. I don’t have the time to go back every time to get my phone’s settings fixed due to *********** staff and then receive a bill for data I haven’t used. I am not going to pay for this data and would like Vodacom to sort out this problem at once.