Missing Data, continued poor service

I have a data package with vodacom , and for the past 24hrs 20g of my data just got used up. I looked at the detailed usage on the app and it states streaming media... however the only thing I use this data for is work, that is emails, and this has never happened before. What streaming media or VOIP can consume 20g in one day. This is ridiculous. And I would like to note this is not the first time I'm having issues with Vodacom and data, there are always inconsistencies with plans, service and even their topup bundles dont last long, it if as if we pay for the data buy don't get the right amount we pay for. I cannot understand how the data can get used up so quickly, I'm the only person using it. Totally disappointed with Vodacom. For the past 6 months I have had endless issues with data, contract packages etc... I am beyond frustrated with this service!