Disputed Bill Amount (Device Obligation)

I did an early upgrade around late May 2022 at Menlyn Store (the bigger store). This application was approved and on the day all went well. 1. The issue started when I saw an amount of R672 on my June 2022 bill which I was not informed about. I called the Call Center and no was able to assist me, I had to go back to the Store where I did the application. 2. Luckily the lady who assisted Me was there, I asked her about the amount, she told Me it's an amount for the Device which is payable whenever a customer does an early upgrade. I didn't have a problem because it made sense why I have to pay the amount and she apologized for not telling Me. 3. I asked her when she did the upgrade how much was the remaining actual figure I was supposed to pay for the Device, she didn't know but she said I will only be paying the R672 for 4 months, which was June 2022 - September 2022. 4. I got a call today, Wednesday 2022-10-26 around 10h50 which lasted around 13min, from Telkom Agent responding to my dispute about the amount that is still on my bill on the 5th Month. She told Me this amount is payable till the end of my previous contract which ends on 2022-11-21. 5. I am in no position to accept this at this point since it was their consultant at the store who gave Me the wrong information. She even asked assistance from her Supervisor who supported her statement that I will be paying the R672 for 4 months not till end of the contract. I cannot accept that I have to be the one to pay for their incompetence and unprofessionalism. They should have given the right information from the start. 6. I want my money paid back in the account they debit from and they should not debit me again for the coming bill in November 2022.