Not so healthier banking with Discovery bank

I have been trying to close my credit card account with the bank since July. I logged a call and each time i follow up, i am told that the department doing closures does not receive calls however my request has been escalated. To date noone has called and when i follow up, they insist on giving a new reference number and another promise to be called within 5 days. In the meantime they continue charging fees as if the request to close does not exist.