Cell C DirectTrying to trick into contract upgrade

I just received a call from Nicole Naidoo from Cell C Direct, and she told us that our contract of 100 anytime minutes will now cost R110, which is not a problem. The problem came when she said that the new contract will be for 24 months without the phone while we were on monthly basis. The second problem is that Nicole (not sure if it's her real name), told me that our contracts are on \per minute"billing not \""per second\"" billing. She said the effect was from May 2014 and than she said that it was from May 2015. She said if we change to the new 100 anytime minutes (as old 100 minutes contract was discontinued)"