Bad service

I wrote a review on Monday 11 November 2017, I had a complaint with Vodacom for bad service, they rep**** on this platform Hellopeter promising me that one of their representative agent will call me back BUT TILL TODAY THEY HAVE NEVER CALLED BACK because they know that they are at fault. I believe that calls are recorded. I was told that I do not owe them anymore the call happen on the 21 October 2019 at 10:55 I spoke to Willona, I told her that I was tired of fighting with them for this one thing than I requested their banking details hoping not to ever hear the word Vodacom but she said the problem was sorted therefore I do not owe them anymore. To my surprise last week I discovered that they listed me for R321. I don’t know what to do anymore