missing airtime and data

My problems started on the 25 Feb 2015 when my airtime went missing without any calls that were made or Internet sites visited. O then called cell c to Report the issue they then gave me a reference number. Few days later I got a message saying that my data was validated. <br> I then asked about my airtime and no one could give an answer as to what happened. They saying I was on the Internet but I don't use the Internet on my phone. <br> I asked for a run down on sites I visited. Cell c sent me four useless pages written smart data Internet. I called again then I was sent a page that was suppose to have ip addresses but to my surprise there was none. <br> Cell c went further to tell Me that my Samsung tablet was measuring data incorrectly, took my phone in and I was told my phone had no problem. <br> Cell c still can't explain where my data and airtime was spent on from the 25 Feb to 18 March. No agent of theirs can explain what's happening or where my airtime was spent on..<br> Called again and still no explanation was given. <br> Cell c is over charging for reason. That's why they can't offer ip addresses on sites I visited. <br>