3 Gig Missing

1st Sept came home from work +- 14:30-15:00 (had sports day at school - I took photo's which proves where I was). Switch on laptop. Vodacom LTE USB says, no data left. Called call-center, told NO DATA was allocated (on 2-year contract after 1 year). Matter referred. Don't use USB modem for week -it causes that I cannot use our WiFi in home-, then plug it in, SMS telling me 3 Gig allocated & used up. How? Called call-center again. Told same thing. I dispute the finding, told the call-center person this. He again refers it, putting note that I must be called. Today (23/09) still no reply. Vodacom WILL take off my money debit-order-wise on the 1st Oct. 3 Gig, gone. Cannot be used up in few minutes. Brother checked that Wind 10 did not somehow download either. Conclusion, first person at call center told me the truth. Next person covering up for Vodacom. Sad when companies don't admit when they are wrong. I am just small fry. Lucky we HAVE ADSL.