Stay away from Cell C

I have been with Cell C for a number of years and never had a problem until now. Two months ago, I got a call from an agent saying my son's contract was coming to an end and did I want to renew. I said no, but was persuaded to migrate the contract to a pre-paid, monthly data package. When I received my statement I see that nothing has changed on my son's phone, and they have changed my contract to a six month contract (something i never asked for and am paying almost double for!). The service I received from the call center agents has been appalling - its like being trapped in some horror show nightmare. One of them even terminated my call, even though i was not screaming, shouting or swearing (though I felt like it!). All I want to do now is have nothing to do with Cell C ever again, but I cant even cancel as this mess with my bill has to be sorted first. I cannot believe this kind of poor service from a private company.