Cell C Network Is Horrible

I am soo frustrated with Cell C their network is terrible. All my calls go on and off, i end up spending 5 mins on a minute call just saying hello hello cause i cant hear the the person i am calling, i have tried different handsets and its the same problem!!!!! i cant even call their customer care cause it keeps cutting off and the agent will just hand up. Am sooo frustrated cause most of my work is done over the phone!!!! I would not advise anyone to get a cell c line!!!