Vodacom incompetence

On 2nd Sept 2024 I got a call from Vodacom personnel telling me about a migration on one of my contracts. When I asked about and installment, he specifically stated that it was a migration not an upgrade and therefore I will not pay anything extra. To my surprise when I received my invoices, I saw the installment was up by R500 and called Vodacom same day and they said they were going to cancel and revert back to me after 2 days. 2 weeks later still my query is not resolved. I kept calling vodacom but they blocked my number from call center and I alternately had to make a call from a work number. I called again 31st and was advised it was going to be escalated but still today no feedback, and I am paying for something I did not want. I need this thing to be canceled ASAP