Overdraft

I’ve been calling fnb customer service to close my overdraft account which I had paid up and was told it was closed . Upon my follow up I noticed the overdraft is still active I then contacted fnb again and no answer is given on the message chat . I’m frustrated with this fnb than refuse to do as the clients advise but is quick to blacklist the clients when they can’t pay .I DEMAND MY OVERDRAFT TO BE CLOSED 😡