Mislead to take a specific contract package

I did an upgrade on the 23/24 July 2015. The sales lady told me that with the package she explained, I can be able to transfer airtime from the airtime I will be receiving on the 1st of each month, beginning of September , I couldn't transfer airtime, then when I called, customer service explained that was impossible, airtime received is not transferable.The issue is that I only agreed to take that package based on what I was told when upgrading, spoke with the sales person who did my upgrade, I even suggested she gets the recording of the conversation between us so we can save time, she since then said she will go listen to it and call me back before end of business, its now October and she hasn't called me back, 01/10/15, @ 8:20am I called and asked for the manager, was transferred to the team leader, I explained the issue to him and at the end he said he will call me back before end of business, its now 02/10/15 and he still hasn't called me back. I asked him to transfer me to the sales lady and he insisted that he will attend to it and call me back. The sales lady **** in order for me to take that package,team leader **** about calling back. I think there is a law against such