Vodacom's financial benefit to NOT assisting clients

I have 3 contracts with Vodacom, 2 of which are purely data contracts, and the primary (cellphone) one has been in place for over ten years. One data line seems to regularly be depleted of 20GB of data within 5-7 days of the beginning of the month. Their app shows it as 'uncategorised data' which, according to Vodacom, is data which is (and I quote) "not arranged in any specific grouping.eg Whatsapp, Google etc. It would be sites you've accessed other than your Apps". This tells me NOTHING of any value whatsoever. Repeated requests for help in finding out what sites specifically (other than the Apps) have been accessed in an effort to ascertain where 20GB of data vanishes to so fast, have been met with a single-minded response, and again I quote: "Kindly try to review your data usage on other data monitoring Apps to get a clear understanding of where you may have used your data".

What Vodacom is admitting to is: a) Their app is all but useless in tracking data use; and b) They will not assist in tracking data use. Their response also infers that they have no vested interest in assisting because obviously they benefit financially from me having to buy additional data every month.

Now, I KNOW that they have the systems in place to provide a customer with a detailed breakdown of which sites have been accessed, as they did so approximately 6 years ago when I inadvertently used out-of-bundle data and landed up with a massive bill. Incredible how in the past 6 years their customer service has deteriorated to the point of non-existence and in fact seems focused on causing as much irritation and frustration as possible to their customers.