personal loan account

I have a personal loan account with nedbank. it happened that I face some difficult time and was not able to pay my instalments as I should. however I have manage to do so and pay all the remaining instalments so that my loan can be up to date. now when I ask nedbank to update my account with the correct balance remaining to them they refuse and say I should pay full amount first. but the term of the loan is not over and at the moment the outstanding instalments has been paid. why are they still putting the old balance of my loan as a judgement instead of changing it to the current one? the balance is no longer the same and it does not have outstanding. I have paid all outstanding amounts so to clear my name why do I still have to look bad while am not. why don't they want to remove my name as bad payer or maybe not remove it but update it with correct amount, as to them even when I have paid the arrears am still a bad customer, but cant I be the bad customer to them only because what the itc systems are reflecting is incorrect about me.