No one can account

I had a really bad experience with Vodacom where by I moved into a new house and with that my fibre had not yet been installed. I decided to buy 10gigs of data so I could hotspot myself as it was on special at the time. The first 10gigs lasted the Friday night and the afternoon of the Saturday, it was a bit alarming that it went that quick but I was okay with it as it lasted basically a full day. I then bought a second 10gig which lasted all of 4 hours. I questioned myself as to how can one 10gig last 24hours and another last 4 hours, doing the exact same thing? Upon my complaint they mentioned that I should look at my usage as well as my detailed usage. I did so and saw that with all of this 9,2gigs were unaccounted for. For 2 days there was a back and forth as no one could find out where the funds had done. I took screenshots of these as proof, they had also requested proof but still could not explain where my data had gone. On Monday morning they decided to manipulate what ever and add my usage to one of the things I was watching, which I do not understand why because I do have the screenshots to prove that, that’s not true. I was then told to download an app to tell me about my usage or which I feel is really unnecessary as my phone shows me in detail where my data went. I feel it is very unacceptable that no one can account for my data that disappeared as well as no one can show me where my data went, when I can give them a break down of where my data went but they do not want to deal with facts but rather be dismissive. After more then 20 years of being a loyal customer, I think maybe this is where our journey should end if there is no resolution to this.