MTN in breach of contract agreement.

I took out a contract 1 August at MTN Clearwater Mall. They took a week to activate the sim, their consistent excuses is that the system isn't working. I took out the mega 10 deal which is on promotion, so i should be getting 40gb anytime and 40gb night data. I have contacted all the mtn support i could, everyone blames someone else. I logged this ticket *** and was told it will be resolved in 24 hours and that someone would call me, it is now 48 hours, still no resolution. When i asked the guy at the store whats the status of the ticket, he says its been closed and that another should be logged. He doesnt log another and they all sit there like clueless *******. I am extremely ****ed of with the service. If i dont pay a month, MTN will blacklist me and i will get penalised, but now that you are in breach of contract for not supplying what is promised, what can i do? Im just a customer without the resources to penalise you. I want my contract cancelled, i am not paying a cent for anything further, I had to run to the store a couple times, my time wasted chasing you people, making phone calls to Lison at the Clearwater branch, you have costed me enough money already, absolutely pathetic service from every contact including twitter and your lousy call centres.