Unjustified Data usage billed (Vlive)

I have been billed for 875MB worth of data on a single day (R734 ex VAT), which is shown on my itemized billing. The Vodacom call centre took me through a procedure to check whether my phone's settings allowed for any background data usage/downloads, but none of these settings were active. I also do not have any music or movies on this phone. <br> <br> Vodacom call centre was not able to prove that I had actually used the data. Based on the date and time of the data usage, I was at home with Wifi on, so unlikely that I would have downloaded anything of this size on 3G. Especially as I do not use Vlive.<br> <br> Upon my request for more detail behind the data usage, I was told that I needed to go to court to request a subpoena in order for Vodacom to provide me with more detail. That seems ridiculous.