Elite Mobile deducting money where they should not have

I got a call from Elite Mobile last year in August stating I can change my Vodacom package for more airtime and data. I asked it this is going to cost me more money and the rep said not at all. Months later while i was contacting Vodacom to upgrade one of my numbers, I noticed that I was paying more that I should. Vodacom said I need to Contact Elite Mobile which I did. I requested the recording from Elite mobile and it was confirmed by the Elite Mobil rep that the person that upgraded my package did confirm that there is no additional fees and that Elite mobil will be refunding the amount billed. This morning, I got a call for Elite Mobile stating that they will only be paying the last two months as I should have noticed the incorrect amount even though they are basically *****ing money from my account that I did not agree upon. I told the rep that I will be taking this matter further if they don't rectify the issue.