I’m disappointed

So I went to the branch in Hillcrest to purchase data , more specifically the LTE deal because I initially wanted the DSL but DSL hasn’t been introduced in my area as I was told by the lady helping me.Fine, I opt for the LTE and the lady turns to page 35 of the Monate catalogue and I’m suddenly drawn in by the R349 deal which consists of 90GB day time plus 90GB night time. I buy it and load in onto my data simcard which is registered under my mom with the number +27 (81) *** but then when I look at the slip it’s only the 40GB day time plus 40GB night time. And I paid R360 ! She showed me that page and when I query about it she flips back to the page before ! I’m so mad ! She didn’t explain any of this