Forfeit airtime

From October 2013 to October 2015 I have been on a straight up 400 contract. In July 2015 I was informed I was due for an upgrade. During the past 2 years I haven't used all my minutes each month and have accumulated up to a maximum of 1200 minutes. In July I went to cell c, lakeside mall, benoni. I explained to the sales person that I did not need 400 minutes a month and wanted to change to 200 minutes a month. I also queried extensively about my accumulated minutes and was assured that I would not lose them. On 6 October 2015 when the new contract started the accumulated minutes disappeared.<br> I was sold and signed this contract with the understanding as said by the sales person that my accumulated minutes would not be lost. If I had known I would lose nearly 20 hours of airtme I would not have signed this contract.<br> I phoned Cell C and was told I should visit the Lakeside mall store. I went to the store and was not given any satisfaction. Mpho the lady in charge only apologised on behalf of the sales person Vuyani Mangqu but said she could not give me my minutes back as this is done through Cell C head office.<br> I want Cell c to either give me my minutes back or cancel the contrac