cancel the deal, I'm done with mtn

I app**** for a contract with mtn in the beginning of December, for 2 phones. Delivery came and only one phone was sent. It took them a month to collect it and another month to make a delivery again...again only one phone was sent. I do understand if they make a mistake, we are all human, but to make the same mistake twice... worst is that I'm trying to get hold of Jeanell who assisted me with this deal, but they can not put me through to her, they can only sent her an email to phone me, which never happens. I have had it with mtn, I want this deal cancelled and the debit order as well, which is the only thing that they did correct, only problem is that I'm paying for something I don't have...If I never have to see or hear from mtn again, it will be to soon, this is by far the worst service. I have been logging complaints since January, to date no one has ever responded or tried to solve the problem. I have even asked for managers or supervisors, they just don't exist. I'll go back to cell c, at least I had a phone, with no service... with mtn it's no phone,no service,no feedback and they just don't care.