DO NOT EVER TAKE A CREDIT CARD FROM AFRICAN BANK

I had a credit card from African bank for R4000 last year September i asked for a settlement i went into the bank and paid just over R4000 and asked for closure of the account. The account was paid up but never closed and now the are billing me each month and interest is accumulating they are insisting i pay them over R700 i have spoken to over 10 agents, managers, supervisors etc they are all rude, abrupt and do not have a clue as to how to solve this. Today the legal department called me and threatened to come to my work if i didn't pay. yet when i asked for a breakdown of how they came to the amount and an explanation as to why the account was never closed they could not answer me. they say there call are recorded but when i asked them to pull out all the recordings of *********** staff members i have spoken to they have no answer. so now i want them to pull out the recording of the so called legal person who was rude and threatened to come to my work if i didn't make payment. i cannot pay for something i do not understand and i want answers to they poor service because if this account was closed when i asked there would be no interest