******* charges non compliance ignoring requests to close account

Credit Card paid off many months ago. I paid off my woolworths credit card and asked customer service to close the account - they told me they did, but charges kept on appearing on the statement - my R50 credit was wiped out and I owed over R100 which they subsequently reversed, this happened again over the following two months, I called again it got reversed and I was told the account was closed, I promised them that I would contact HelloPeter next as I was getting tired of wasting airtime and time going through 20 questions to verify myself to close the credit card, once again, Now again I owe R120 or so, I get sent sms's about the small balance on my account - what am I being charged for, I am actually owed R50 but not seeing that money instead being charged R50 or so per month for card fees on a card that expired over a year ago and was never reissued either, not only are the charges annoying but the "available" credit is messing with my credit record