Unhappy /unsatisfied customer cell C branch malmesbury

I'm very unhappy with cell C everytime when i don't upgrade my contracts and I'm done with my contract payments all of a sudden the next month a cell C agent call me and inform me that I'm in areas.. Questions being ask but nobody can answer me currently they were charged me for pro rata something that i was not aware of if u cancel your contract within the month notice so currently I'm a very unhappy customer and the Malmesbury cell C branch manger are not one who is going a extra mile for there customers.. And i told him the last time he was like forcefully tell me i must just pay the money which was also a matter that he couldn't sort out and at the end of the day i was paying way to much and now I'm not willing to pay for something that i was not aware of.. Thank u Unhappy customer