Poor service

I have a contract with cell c that's ending end November. I'm at a place where I want to use my data on that Sim now I see that I didn't get my data for the month of November the consultant have a nerve telling me that I used it already when I didn't even use the Sim until I needed the data then went on telling me that I forfeited that data since I canceled my contract but I'm must stil pay for end of November then I asked to be put through to a manager which she did I was listening to that dam music until I dropped the call. That is very poor service from cell c and I want my data for november