Bad contract

About 3 months ago I upgraded my contract and the consultant who assisted me at Vodacom 4 U in Fourways said the contract I am taking I am able to convert the minutes into data. When I received the phone and tried to change the minutes it wouldn't allow me to, when I called Vodacom call center that's when they told I got the wrong info from the consultant as you are not able to change/transfer minutes, that only works with airtime. So I requested to be changed to my old contract of using airtime and they told I can only change after 3 months of using the phone and in which I did. Called the Vodacom today and they told me they'll have to charge me a penalty fee to migrate to my old contract, I told them but it not my fault that I was fed wrong info regarding the contract and they said unfortunately there is nothing they can do on their side unless I go back to the store where I purchased it from and they wont charge me the fee. So I called Vodacom Fourways the consultant who helped me 3 months ago is on indefinite leave and the store manager is off today so the consultant who helped me says I have to pay penalty fee regardless of what i was told. So i don't feel it fair that i was fed wrong info about the contract given yet i have to pay a penalty fee. No assistance at all from the Vodacom shop or Vodacom call center