Vodacom misleading customers

Lady phoned me on 6thMay and **** to me by saying that I was paying R350/month for my line and that she offer me a line for R300. That was a lie, as I did not have my account with me. I saw that night that I only pay R233/month. So I cancelled the next morning. According to the consumers protection act, I may cancel it in the cooling off period, which I did. But I see Vodacom did do the upgrade.