Remove my account as active from credit bereax as previously requested

I had cancelled and paid up my cell c contract last year August or September, but my credit bureaux still has Cell C listed as an active account.. please remove me as I had previously requested , this is affecting my credit score .. I need this to be done urgently as I am no longer your client. reason I left is because of your unreliable service and slow network issues. Please I need my name to be removed..