Hello,

There must be problem from your side or the officials who are in account section.

To solve this go to your university and talk to the officials and ask why. You might be having the receipts or pay log where it have all the information and how much amount you have payed on which date.

So just go and solve it in the college. It is more possible the officials had made some error. after that ask them to update it in the website. then you will get what you want.

Hope it helps!