Poor Service from Vodacom

Hi, please be careful, I recently received a call from a Vodacom agent. She advised me that I was up for an upgrade on one of my lines. so, I agreed to upgrade telephonically, little did I know that she was now signing me up for another new line. Now I've been told that I have to pay double, instead of saving me time and money, I've now made numerous calls and just left frustrated.