Whenever you subscribe to a MTN data plan and your subscription expires, it has been set to automatically renew your previous provided you have enough airtime for the subscription.

This can be very frustrating, especially when you don’t need the subscription at the time, or you have other plans for your airtime. To cancel the autorenewal is quite simple.

All you have to do is
Text Stop to “131”

Shikena.
But, if you wish to continue with the subscription, the autorenewal is a good one.

Source: http://guruscabal.com/free-browsing/how-to-cancel-autorenewal-on-mtn-data-subscription

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