Excessive Usage

I'm so miserable, I could cry! Mweb has been most unhelpful and there is a real problem with my account. A couple of months ago, I was on a 2gb package and 1 month I ran out of data and requested to upgrade my package to a 5gb which I knew I would NEVER exceed, however, eversince the upgrade, I'm being billed R700 additionally for alleged out of bundle usage. This is NOT possible, especially considering the device is not in daily use and has been off since the 26th of November, so what MWEB is saying is that from 1-30 November I used 5gb of data + R700 but the device hasn't been on for the last week of November and was on intermittently for the month of November, I was in fact too scared to use it! Only my cell phone is connected with no automatic updates or background refreshes. Normal WHATSAPP and FB and occasional GOOGLE searches, cannot possibly use 5GB of data. Mweb, throws their hands up and says you should be monitoring your usage...ridiculous comment! On principle, I refuse to pay these amounts because Mweb cannot even show me when/how data was used. No one would agree to pay something without justification :-(