Not addressing customer requests

I activated the MTN PLAY on 07/03/2015 to enable me to play DSTV mobile app on my phone. I then got an sms to advise that I have subscribed to MTN PLAY which wasn't a problem. I tried to then play the DSTV mobile app but it only had the sound and no pictures(screen was blank). I then processed to cancel the subscription on 09/03/2015 at 12:26. I was then assured that the subscription has been cancelled but when I checked realized that it was on actually cancelled. I then made another call to 808 on 10/03/2015 at 9:50 and spoke to Leanie who also assured me that the subscription has been cancelled. She gave me this reference number :***. I then made a follow on call on 18/03 and spoke to Bheka who told me that the subscription is still active and he proceeded to cancel it. he gave me this ref number: ***. I need to know why the subscription was not cancelled on my initial request on 09/03/2015 and state that I will not be held liable for any subscription costs as I cancelled it after a day and the subscription did not even help.