30 days notification / 37 days no response

I enquired with MTN to cancel my contract & they advised me to send a notification in writing 30 days prior to the contract expiry date my initial email was sent to MTN on the 18 May 2015 to [Email Removed] to assist with this. 16 days later (3 June 2015) still no form of communication or acknowledgment of my email was received. I then resent the request. 22 days later (today) I find myself being billed for another month when I wanted this cancelled in the first place. I am highly irate at the pathetic service I constantly receive from MTN. I want this number to be cancelled on contract & converted to prepaid and I would like to know how I'm going to be reimbursed for not requesting an additional month on contract I have not requested this & have advised MTN promptly of the cancellation. Fix it.