Unprocessed cancellation of MTN Contract

I called into the MTN call center on April29th to cancel my contract&move my number to prepaid.The agent did as requested&booked the cancellation of my contract&gave me a reference number.After a few days I noticed that I was still on contract.Being that my monthly contract period runs from the 13th to 13th I left it.After the 13th I noticed that I was billed for the month.I navigated to the MTN website where it mentions that a months notice is required to cancel a contract so I called the call centre but it was closed due to the strike.I tried several times during the month of May to contact MTN but to no avail.<br> Yesterday I received another monthly renewal (the13th) so I go into the MTN branch@TheGlen to find out whats happening.They tell me that the contract hasnt been cancelled,that I have to pay the full amount at the end of the month&while they can cancel it now I will lose all the airtime credited to me yesterday but will still have to pay it!<br> This is absolutely unacceptable ESPECIALLY since I requested the cancellation 2mths ago! Im not prepared to pay an additional 2 months4a phone Ive now already paid for&I want a refund&the contract canceled please!