Billed me for data I didn't use

I phoned to enquire about the huge Data usages on my account, for the 18 till 20 August 2015 they said that they can tell my what sites has been visited. From the mail I received from them to show the time the data was used, I wasn't in agreement, because on the 18th they showed that I use the internet between 16:04 - 16:23. <br> <br> I am at work until 15:45 in the afternoon and only get home by 17:30, then I need to fetch the kids and pre-pared food. For all of these days I was at work during most of the times, where it shows I was on the internet. I even send them a sign on register to show them I was a at work. <br> <br> I've asked them if I could be possible that my account was hacked or the lines was closed, because I hardly use the internet . On the 20th I was at church for a meeting, I have note that I took and forward it through to them. The 20th data usage was between 18:00 - 20:16. I left just after 18:00 to church and came back at 21:00. So I couldn't have use the internet. I feel it is unfair for me to pay for something I didn't use. <br> <br> The sites MTN send me, that was visited, was even in other languages, some of the links I can't even open. My phone has been cut off. <br>