Vodacom

Good day, I'm very upset with vodacom I was told that if I migrate to a new contract plan I won't be charges yet I was charged 150rand ect I then contacted vodacom with this but I told them it's fine I will keep this package because I'm getting more data then I was then this month I been charged 500rand ect when I called vodacom they advised I said I wanted to migrate back to old package an I was charged for changing back, firstly I didn't say I'm gna change back an even if I did no one said im gna be charged for it when in the first place I was told I'm not going to be charged extra for changing the package in the first place .. Its festive I'm R500 short on my account because of Vodacom I want a refund or I shouldn't be charged for next month. I wish I have never took out the contact in the first place!