bad service

I will like to lodge a complaint for the poor service received from Africa bank. I have settled my loan amount in April the account should be closed, but strange enough last month they debited me R330 which was not supposed to happen since my account is on Zero. after I followed up they requested me to send them statement of account and the amount was refunded and I was assured that the account is closed, now is June again they debited R330 plus R2000 from my credit card which is also settle. after I followed up they refunded me R2000 and partially refunded R68 instead of R330 now am being told I should submit statement of account, who is paying for my statement of account and why should I keep being punished for them doing the wrong things. they debit my money for no reason but expect me to follow them before they can pay back what is mine. this is really pathetic and poor service. I have settled both my account why should I be exposed to such abuse. I was a good client adhered to all my payments did not even miss one payment now that I have fully paid them now they want money which does not belong to them just because they have access to my account. why request me to sent you my statement while on the system you are able to see that you have taken my money.