ABSA complaint

I closed my credit card on April . I received my settlement quote . I paid up and got my settlement letter. Two months later I get a statement of account showing I owe 200 . There is no reference for this amount then in may I get charged another 200. I contacted the call centre and was transferred to theee different people. I say for more than 45 minutes requesting information on why I was getting charged two hundred rands every month when my account wa closed . No one could assist me . Finally someone said they will investigate and call me back and I didn’t get a response . I feel like I should make people aware of charges being placed on their accounts . ABSA needs to tell me what they are charging me for and how can they charge if an account was closed and had a zero credit limit