MTN lack of service

In my opinion MTN's client services are the worst in the world. When offering a contract to you their consultants mislead you and once you've received the package it is quite different. On the 17th of February I was amongst others promised 150 anytime minutes on contract but only received 100. Iv'e sent them 4 emails in this regard and made 15 calls to them holding on for up to more than a hour before being attended to. Each time they promise to rectify the matter but the moment you end the conversation you receive an sms "case is closed" and nothing further happens. I have the recording of the telephonic conversation between myself and the consultant when we closed the contract.