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Maybe there is something wrong at the Telstra 'usage recording' end. Despite it being the Digital Age - I keep a written list (in my Mobile 'Notes') of my remaining Mobile and Bigpond data every morning - using the Telstra app with my morning cup of tea.
Fairly obsessive and 'old school' but it works for me.
Yes, other suppliers give more data for $30 but I go for reliabilty. So far OK.
Facebook and Snapchat are fairly media intensive. Google can also be a data hog depending on what you are looking at. I am not sure how you would manage keeping under the data limits with those small recharge amounts. As per the comment above, Vodaphone probably gives you more data and a slower connection and that’s why it has been lasting longer.