Bad sevice

Bad sevice from Game and RCS, i checked my balance on the 23rd July at west gate branch then i settled the whole balance same day then went to accounts to close the account which i was told to come friday for funds to reflect. I went on the 25th July to close the account which i was told it will be done and someone will call me. Nobody called then i did a follow up today which im told the account cannot be closed until 36 days.Because of accumulated interest. Interest is charged on the 7th and payment was made before the next interest but they refuse to close my account because of accumulated interest that is not charged yet.