Cell C not responding at all

I have a data contract with Cell C , when this contract was up for renewal I wanted to cancel the contract and move to a different service provider as I could get better deals in the market . Cell C managed to change my package to be competitive and I agreed to renew the contract. My data just don't last I have been monitoring on different ways to try and understand why and how this is happening, In March I started my long journey with Cell C , I opened my first case to get itemized usage to see what devices is using data I was told that a detailed data usage extraction will take 30 days. Eventually after 38 days of absolute silence I managed to get through to the call centre again only to find out that a case was never logged. I then tried to open another case the operator then told me that I am not on the package that I am referring to and my actual package is half of what I was stateing. I then asked for two things to happen 1,. They need to get the recording when the package was sold to me as I was sure of my facts as I did market research at the time, 2. Get itemized usage billing for my contract. Eventually I was called by Cell C and they confirmed that the contract I was stateing is the correct contract and they don't know why the previous operator stated otherwise. I eventually got my usage bill after doing a excel sheet my usage was 1/3 of what the contract should allow. I have send several mails with my supporting documents and they are not responding at all. UnfortunatelyI have 5 contacts with them shows how important customer service are to them.....