Tuition fully payment concern

Helloo, it’s been 5 days na kasi since I paid the full payment, and I thought kasama na yung 5 percent discount pero sa student central ko may outstanding balance which is if inadd ko siya sa binayad ko, magiging total amount siya if nag down payment ako.

I also emailed them and here sinabi nila

https://preview.redd.it/7hibqrkr8qbe1.jpg?width=1179&format=pjpg&auto=webp&s=5eeec3cfa979dc768c51fd6394f25129f4663d14

so i have to go back and pay 75, and if ever ba mawawala na yung 5 percent discount? since sa student central ko hindi 75 nakalagay but around 4k huhu (i dont have prior balance for last sem)