2 GIG DATA GONE IN 2 DAYS??? VODACOM KEEP TELLING ME CHECK YOUR PHONE!!!

How is it possible for 2 GIG of data just dissapearing if you do your normal day to day usage? Vodacom keep telling me to check my phone and do restrictions. I have my Samsung J3 for a year now, using my hotspot for internet to enable me to work from home when necessary for the last 2 months and NEVER had a problem of data just dissapearing! 1 GIG is usually enough for 1 month, now, within 3 days 2 GIG of data gone after I used my hotspot twice for not even half an hour or 5 minutes??? I would like an explanation and/or my data back!! I've changed or done nothing other on my phone than normal and refuse to just accept that it is my phone. Vodacom is *********** his clients, we don't have money to throw in the water, neither grow money on our backs. They need to investigate their systems!!

I really hope this will get attention and that I will receive feedback as soon as possible.