Vodacom is using our DATA BUNDLES without showing proof for what!!!

As a "valued" Client of Vodacom for 30 years I had the most shocking experience with them this Month. I had to re-buy DATA BUNDLES 4 times and this after their "as a goodwill gesture" (their jargon to bypass legal action) they refunded me some of my original and then bought DATA BUNDLES. I have my Vodafone Mobile Wi-Fi R208 device for over 4 years and get 2 GIG data bundle every month on my contract. This is the first time this happened in 4 years. My Laptop was replaced in May 2018 and downloads was going through as soon as I connected to my device. I work for a big company where I connect to their Wi-Fi, with a very strict IT Department that stopped us to connect to any Websites that will harm our Server. They stopped all connection to Websites that will harm our Company. Then I asked them to block ALL DOWNLOADS, when I am on my 3G device. This was done and I sent proof to VODACOM and asked them to send me proof from their side that I downloaded anything whilst being on my Device, BUT IS STILL WAITING. I opted out to get Itemised Billing from VODACOM, because it only cost you money so I have no proof from their side. But.... I sent them all the proof they need to see that NO DOWNLOADS can take place whilst working at home or on the building sites of our company AND USING MY 3G DEVICE. Yesterday whilst being at work I could see that a MICROSOFT DOWNLOAD was done at the office whilst being at the Office. This morning I ran out of DATA BUNDLES AGAIN and bought another 500 MB which they took immediately... When I phone they told me that they can SEE that I downloaded MICROSOFT update. This was done while I was at the office. Our IT Department showed me proof and I sent all this VODACOM and asked for proof from their side - I AM STILL WAITING... with query numbers the lot... The Government made all the companies to make the DATA BUNDLES more affordable and Wi-Fi and Fibre Optics is now available all over the place and you can so you don't need to use your own and now they are trying to get their pound of flesh from somewhere. They even sent me an SMS that I can get Fiber Optics -after my call to them - for a very reasonable rate... I am sick and tired of their TECHNICIANS telling me that I am downloading stuff on my 3G Device which is impossible with the stop that my company's IT Department put in place and I sent them proof of this. Where do I go to where this will not happen anymore? Please HELP!!!