Bad service from VODACOM

I called in to upgrade my contract and I was told that I already upgraded in July which I was not aware of, and my contract end in 2020 January, according to them I have upgraded 6 months prior ending my contract to the same data bundle but more premium that what I was paying, I even requested the recording but I couldn’t get, spoke to Kabelo (Retention) and even no one came back to me to date, called in again and request someone superior and they said they not present at that time bu t advised they will call me back, no feedback as in now.