Huge billing account

Use Vodacom for years now, never had a problem until end of february recieved a huge billing account of R3552.99 which I refuse to pay. My vodacom package is not more than R 1000, smart package 250mb. Almost never make calls or send sms and I use another device and network to search the web. Went to vodacom and asked for itemised billing account, there's not much detail they give you except for a few lte.vodacom lines with huge amounts that I have no idea what that is charged for. I have deleted every social app on my phone including some vodacom apps I never use but the phone had them installed. I will pay for my normal cellphone package bill I signed up for, but I will not pay for data that vodacom can't show me what excactly that is. Spoke to many people about this and a lot of them are complaining about vodacom charging them high amounts for data they never use. I put a limit on my phone so the network cuts of when my 250mb data is finished. If vodacom can't clear this up for me I would rather close my account with them and go to another network provider that won't take all my money.