Go to their prepaid site and tell me how much data you think you get included initially with their $30 plan - no cheating by hunting through the fine print in the CIS.
https://www.telstra.com.au/mobile-phones/prepaid-mobiles/off…
If you actually sign up, you get told it's 10gb only, not the headline 30Gb. Notice how the 2GB plan to the left of the "30GB" plan specifically says 2GB in the data section? The $30 plan avoids stating the initally-included data anywhere on that page. Only if you dive into the CIS on another page can you finally discover it's 10GB only.
This is misleading at best, think I have a case?
Not sure what you're looking at as it's pretty clear that it's 30GB for the first three recharges before reverting back to 10GB from the fourth recharge onwards.
Next minute: Post unpublished by OP request.