Struggling to get 3G Data Subscription Cancelled

I currently have a MTN Cell Phone Contract and a MTN 3G Monthly Data subscription. The 3G Data Subscription are not under contract anymore . I have been trying for over 6 months now to cancel the 3G Data subscription by phoning 808 and also via email.

Yet again, the monthly subscription has not been cancelled and I paid again by debit order this month for the subscription service I do not want and do not use. How many times do customers have to plead MTN to please pay attention, do your job and cancel a subscription - Pathetic Service

I will now have to start the same frustrating service over again. I will now also try and cancel the debit order at my banking institution.