Advance airtime manipulation(**** & ripoff)

I took R250 advantage airtime today cause I wanted to get 30 GB data as I will only have money tomorrow and I have an assignment due today I couldn’t wait for tomorrow to buy data. I was surprised when I realised my advance was divided into multiples of R10.00 so each can be charged a fee separately. I never took an advance before so I didn’t know what to expect but turning that into 25 transactions that’s unacceptable. Now I understand why my parents always complained that their advance amount is always inflated