Pathetic service delivery from Vodacom

On January, 26th 2023 I wanted to migrate to Vodacom while starting a new contract with a handset. When the phone was delivered, I saw that Vodacom issued me with a new number, and not the migrated number as agreed. Hence, I requested them to fix this mistake. According to them, I had to cancel the contract, and they will collect the phone. Since then I was phoning Vodacom at least every two weeks, tried all the possible avenues to get this sorted. Tomorrow is the 1st of December 2023. Vodacom is still deducting money from my account, more than R 6000 to date. The people working at after sales, is not willing to talk directly to me, they claim that they can't send any mails to confirm our discussion, nor able to give a reference number. What should the next step be to get Vodacom's attention. Every time I spoke to them I remind them to record the conversations as I will have proof of the discussions on my call list.