Just Cancel my Card!

I contacted Discovery Card on 30 Jan to close my card as there were a number of fees coming off. Since we had relocated to the UK, barely used the card and could justify the costs. I requested the card to be cancelled. I received a mail from Discovery giving mi a form to fill in and a final payment guide over the next few days. I was also informed that a request to close my card protector was put through. I made payment (more than the required amount to be safe!) and sent the form through within a day. I didn't hear anything back until I received a statement on the 20th Feb with the card back into a negative balance from yet another fee charged! I contacted Discovery about this and asked why my card had not been closed. I was told it was the card protector that needed cancelling. I disputed this as the request to close the card protector was put through and I was informed it was sorted. I have been met with radio silence every time I have tried to find out more about this request. I need ALL the charges to be reversed and my card closed now. I refuse to pay another cent for poor service and misinformation.