Credit card closure

On 23 March 2015, I settled the balance on my credit card account and I requested that it be closed. On the 25 march 2015 African bank debited from my account and I went to the bank to reverse the transaction. Few days later I got an sms threatening to take legal action. I ignored thinking my request was still being processed. On 24 April 2015 African bank debited from my account. Today I called them after I recieved an sms asking me to pay my installment. The consultant said the request for closure had not been processed. It is costing me money to go to the bank and reverse the debit orders. Please get your act together if you guys still want me as a customer in the future.