Reaped off by vodacom

Good day, I am very frustrated with Vodacom, I have been calling them back and forth for the past 4 months trying to figure out how come my premiums have increased ,I told them that I got a call from one of their agents offering an upgrade without an additional charge to my premiums,I requested that they listen to the recording and come back to me and reverse the additional money that was deducted from my account, that has not happened. I called again yesterday and was told that they do not see any notes on my calls about my complaint and I should call rewards department, I m sick of this back and forth thing ,I just want my money reversed and credited back to my account and my original package as per my request to them like a thousand times over, instead they deducted R1166 from my account .This is just frustrating.