I don't want MTN night-time Promotional Bundles

My phone has been using my airtime for internet instead of data bundles.<br> <br> I called customer care and was answered by a who told me that the internet is using my promotion bundles that work between midnight and 6 am and uses airtime during other times. I didn't know I have such promotional bundles and they were misleading me. I want MTN unsubscribe my number from those promotional bundles as I don't need them. I know Vodacom used to have such and I think MTN copied it from them.<br> <br> The lady I spoke to seemed to be ******** of process because I asked her for the customer care email contact and she said MTN does not have such an email yet I have used it before. It baffles the mind that people are employed in customer care positions and they yet don't know basic information about the work they are doing.<br> <br> I eventually found their email address that the lady said doesn't exist and sent them an email but from my past experiences, I know it will take ages before it's rep****.