Dissapointed

I have brought two whatsapp bundles on the 16/06/2019 and the 20/06/2019 . That would have meant I have roughly 2GB for whatsapp but it seems when viewing statuses and downloading music via the app my normal data is being consumed. Today I decided to call them about this and they stated this is impossible. When I asked them how is it possible that I am left with 1.93 GB on whatsapp when I have been using it alot they stated that I have not been using it that much. I buy around 1GB or more each month this is depleted quickly due to this error they might be having on their network . This needs to be sorted out or tell us if they are not wanting us to use their network.