What am i paying for?

I called Cell c to advise them that they must terminate my contract when it expires on the 02/11/2015, and the call centre consultant confirmed that because I gave 30 days notice, they won't bill me for November. I called again for the second contract to do the same, give notice to cancel on expiry date and was given a total different story. The first contract has expired and changed to pre paid, but the next payment shows a full amount. How many times must i call cellc to notify them of the same thing. I did not use the benefit, what am I paying for? DO NOT DEBIT MY ACCOUNT.