*****ing my money

I just bought R60 airtime, and then proceeded with buying a 1GB voucher from the MTN app for R29, first it asks me if i want to upsize to 1GB, which is the same option that i have already chosen, for R35, i proceed with clicking no, purchase goes through, check my balances and only have R13 airtime left. This is day light roberry. Fix your ****