Cell C in Breach of their Contract with Me - Paying for a Service which I don't receive

I have been struggling since December to dial numbers, people have been struggling to get hold of me. I cannot get data when I need it, like the time I was using waze to get somewhere and the data signal was non existent and I had to stop on the side of the road and a ******** shoved a gun in my face demanding my cell phone. I cannot run my business like this. I have changed my sim card at my cost, changed my settings but to no avail. I can't get hold of the customer services department. Technical Department or the CEO to cancel my contract. Cell C are in breach of their agreement with me. I have been paying them for a service since December which I cannot use. The National Consumer Council needs to hear about this. And I am not the only one having problems. I can't get hold of them on their customer service number. I've tried logging a call via e-mail on Friday. Still Nothing. I've tried everything to get hold of these people.