Data bill over R8000

I have been a Vodacom client for well over 10 years. I have got uncapped fibre internet at home, as well as at my office and am on Vodacom's highest package (VIP Red) which comes with 5GB of data. I use my phone for emails and occasional browsing with no social media whatsoever. I don't use my phone as a hotspot as it had been previously.<br> I went into the Vodastore in the Waterfront to pay my bill, and the shop assistant casually mentioned that my data usage for the current month was abnormally high and sitting on approximately R8000. Last month I got 2 messages from Vodacom:1 saying that my data bundle was almost out and 1 stating that my data bundle had run out. On both occasions, I immediately reloaded data bundles so as not to go into out of bundle billing. (As a long term client of Vodacom, I am well aware of the exorbitant costs of out of bundle billing.) Vodacom's gesture was to credit R5000 to my account, leaving me with a R3000 data bill on top of the R2000 monthly subscription. If they are truly a SERVICE provider, they would protect their clients against this situation and rectify the much documented data billing issues.