Over charging

I am absolutely furious with CELL C, this is the reason I cancelled my contract and chose another network provider. It is because of the pathetic and rude customer service. I cancelled my contract way in advance,the date of termination was 13th September. I was to be charged a pro rata rate because when I started in 2013 I was charged a pro rata rate then. Your billing department charged me the full subscription, I called to complain,held on the line for over 40 minutes being put through to numerous useless agents who could not help me. I left it because I got very frustrated. Now in October I get charged again, the full fee. I called cell c and held for 1 hour and 27 minutes being put to different departments. I have screenshots to prove this.This issue is still not resolved. Unacceptable that you treat clients this way. I never had good service with cell c because it seems you have *********** *****s working there. <br> I want my Septembers fee and Octobers fee back. I was also sent a sms stating my contract is now changed to prepaid in September so why am I getting charged for October too. Cell c has done this to many people. Bunch of *****s in the billing department.