Mtn failing to deliver

Mtn has yet disappointed, I upgraded my contract two months ago with Mtn, the package i took included airtime , data and smses, I received my monthly package excluding smses. I called in the call centre 808 spoke with an agent who said firstly the package i took does not include smses, I then requested to speak with the supervisor, they logged a case for me to do a follow up within the next 72 hours. I actually never did receive it, second month same thing happened, I called in explained my query the agent told me he has to relog the case. Then again I called in this time 72 hours later, the agent tells me it has been loaded I should wait for another 24 hours, I mean I'm meant to pay for something I'm not receiving , I've actually had enough I'm getting no joy. How hard can it be to assist with this .