Disappointed with Vodacom!!!

I signed up for the first time over the phone with Vodacom for my upgrade- I usually go into the store. The lady was very helpful BUT she said to me that my contract was 36 months- I told her that this was NOT true. If she looked back at my history, she would see that it was ALWAYS 24 months and I have always upgrade every 24 months. She said she will change the contract period. I later received my contract upgrade documents but it STILL showed 36 months!!! I called in at Vodacom and advised them of the situation and they said they will look into it- THIS WAS END OF NOVEMBER. Until today- 31 January- TWO MONTHS LATER- NO ONE has gotten back to me to give me feedback/fix this situation! I called in several times and have reference numbers for this and I messaged on Vodacom messenger a few times (have proof of all of this) and STILL NO RESPONSE. How long can it take to listen to ONE call recording between myself and the lady who did the upgrade for me???!!! And then to find out what was said between us and establish the correct contract period!!! RIDICULOUS WAITING PERIOD!!!