Discovery won't Cancel my Credit Card

I called Discovery Card in December, and found I could not use my card, as I never got it and it was never activated. As a result, I requested to close the account. The closure forms where sent to me on the 12th of December 2017 where I then completed them and sent them back the same day. The cancellation was not processed. I then called discovery on 31 Jan 2018 and spoke to a Katlego, who asked me to resend the cancellation form which I did, and still did not hear anything afterwards. On 2 March 2018 I called again and spoke to a Celeste, who promised to call me back by the 4th. To date, I have still not received a call, and being charged on a monthly bases for services I cannot use. My card is fully paid off, and discovery actually owes me over R1000 back based on all the fees they are charging me from the 12th. Will they ever cancel this card and pay me what they owe me?