Unable to cancel my MTN contract

My contract was to be terminated on 12 March 2015 which is why using the self service option on the [URL Removed] website I issue the first cancellation request on 02.01.2015 (REF ***), I was put through to customer retention and further advised the consultant that I DO NOT want to continue as a contract subscriber. Then on the date that my airtime balance usually gets topped up, I receive an SMS saying that my account has been topped up which meant my contract had NOT been cancelled which is what I had requested. Again using the same website I submitted another request on 21.03.15 (REF ***) only to login and find that the query was CLOSED with a comment saying the customer had been retained. WHY WOULD I SUBMIT ANOTHER REQUEST IF I WERE RETAINED AND DID ANYONE BOTHER TO CALL AGAIN TO ASK IF I AM TO BE RETAINED. PLEASE CANCEL THIS CONTRACT AS PER MY REQUEST REF *** and ensure my bank account is NOT debited at the end of this month! If someone didn't do their job correctly at MTN that is not my problem.