BREACH OF CONTRACT BY MTN

I upgraded my phone on 18/04/2015 to a Samsung Grand Neo Plus. 3 days later, the camera stopped working. We took the phone in a week or so later (i.e. now 3 weeks ago) as I am battling to get to the nearest branch, and still haven't had a bit of feedback.<br> On 01/05/2015 they passed the debit order through my bank but yet, I did not get air minutes as per contract but airtime, I got my sms's but 0mb of data.<br> I complained at the nearest store - they sent through a query to MTN - it is now nearly end May, still no data for 14/05, they are again deducting June's subscription in a week's time, but yet no rectifying, no phone, no nothing - what do I hear? They are on strike. Well, I'm gonna stop my payment of 01/06 and take legal action - I am 100% sure that MTN will take me on for Breach of Contract. What a Joke - wonder who will win this case? I have the facts and I never loose.