Poor accounts management from RCS

I have 2 loans with RCS which were both settled before the loan due dates. On both occasions the settlement amounts were provided by RCS and payments made on the same day. However after the settlements were paid up I received a balance on the accounts and found that there were outstanding amounts on the accounts. In both cases I called RCS to advise them that the account had been settled and was told that it would be rectified. Today , I did a credit rating check and found that both the accounts still appear as active and have outstanding balances.