Rain nightmare!!!

I'm tired of these guys, I opened an account with them, I got the first free 7 days, after that the sim card stopped working. When I looked at the usage it was going up yet I was not using the sim card. I reported the matter to them and many of their consultants at first didn't believe that I was not responsible for the usage until I sent the pictures of the numbers on the sim card and the packaging, which are not coinciding, then they say they will do a sim swap. They then sent another sim card, which they said they will do a sim swap on, I've been waiting for a sim swap for the past 5 weeks, while all this was happening the usage kept increasing. I contacted them on Facebook, they told me their tier 2 technical support say the sim card is operating in an area that's not where I am. They say I owe R350, for a service I did not use, I've been very patient with their incoherent communication. If I don't say anything they keep quiet!