Huge mission to close a Discovery credit card.

I have been trying to close my Discovery Credit Card since Monday morning. I first called client care. The consultant informed me that she cannot do it and it will take up to 5 working days for someone else to call me. This is unacceptable. Why must I wait so long and pay fees in the process. I then mailed Discovery Card and got an auto reply that it will take 48 hours to receive a response. Well, 48 hours have come and gone. No response from Discovery Card. Can someone please phone me and assist in cancelling my credit card?