Cell C: ******* that breach contract and treat people like cr*p!

So i go into the Cell C store here in Nelspruit at Ilanga mall to terminate my contract after 2 years, the main reason was because they just don't have the coverage here and half the time there is just no signal at all. The guy that helps me out is very well mannered and helpful and so far my experience is good. Then I get on the phone with some lady at a call center and while I'm trying to talk to her she just half screams over me with the worst attitude I've ever experienced from a customer service center. She goes off at me for wanting to end my contract because I'm due for an upgrade, and i mean she completely looses her sh*t. After explaining as calmly as possible under the circumstances that since i have paid my account until the end of April I would like for Cell C to terminate my contract strait after this time period. I eventually get her to calm down (which i don't think is my job as a customer) and she agrees that she will arrange for my needs to be met. At this point i think everything is fine and i shouldn't have any more problems...wishful thinking on my part. So now on this day the 8th of March they have completely disconnected my line, I'm sitting here so frustrated and disappointed. I mean is this them trying to get revenge on me for not wanting to continue doing business with them, or is this because as a company they really just don't care about their reputation or their customers. Basically i have been ****** and they have breached contract. does anyone know what i should do next? I have already tried to contact them with little next to no success.