No Service at all

I am a Cell C client for a very long time now, our local branch closed down without any notification or "just so you know", so our closest branch is in the next town. In December I made the effort to go there and asked them to assist, I never have any minutes available nor data, there is obviously a problem somewhere. They informed me there is no problem but that if I want to add minutes, I must purchase airtime and change it into minutes. In store they provided me with a number ***5, that does not exist anymore. Two months down the line and same story. I tried calling the call center to assist, but I cannot get through to anyone and it simply says to visit your nearest service provider. I am not at liberty to just jump in the car to get this resolved when Cell C cannot render a basic service. I was told to use roaming, otherwise I cannot call at all, and this is unacceptable as my charges are higher with roaming. Since when can one not just make a normal call and never have any data available. This is definitely not a good service provider and is not user friendly at all. How do I get this resolved?