********** on data that cant to proven despite app showing I am in my limit and call centre confirming

The last few month my bill had doubled and I have called into the call centre to query each month but simply get told I used the data but they cant prove it to me. Last month I monitored my data through the app that I was previously told to use and my data was still available yet my bill was increasing rapidly each day so I called the call centre who confirmed that I still had data so I was not concerned. Issue persisted a few days later and my data stopped working so I went into a Voda store and they checked my phone and could not explain the issue and in fact while I was sitting at the store my bill rose by over R300, this after I called the call centre and again was told that I have data and they referred me to a vodacom shop. Despite using the app, calling the call centre twice and visiting a store no one could tell me what the issue was and now Vodacom want to bill me over R10,000??? The store queried this and I also called in AGAIN and all I get is a sorry but you did use the data but as a valued customer we going to provide you with a credit of R3,000. This is ridiculous and unacceptable!!! I used your app, I called your call centre twice and I visited the store yet I was told that I still have data available and no one could assist and when you raise a query you do not get the chance to speak to anyone but rather get a call centre agent that is clueless and then a email with no opportunity to reply or discuss with anyone!!! I will not be ****** like this and will not accept this!!!!!