Discovery refuse to cancel my credit card

I moved to China in early March-2016. Before I left South Africa, I made the point to call Discovery to cancel my credit card and pay all my outstanding fees.<br> I have waited for them to cancel my card.<br> But recently, I just received my credit card bill for March (which there is no expense, because I cut up my card already) but there was a card fee.<br> I wrote to Discovery to enquire why they won't cancel my card. I have received no reply.<br> <br> I want my card cancelled and I am no longer in the country, so I am not going to waste my time and money to call South AFrica to sort this out.<br> Discovery, please contact me by email to sort this out!<br> [Email Removed]<br> <br> Thank you.