Contracts migrated without my consent

In June 2020 an agent of Vodacom phoned me and told me about the about certain contracts that can migrate from a Smart M+ to a Smart L+ so we discussed this and I asked him at the end, are you sure you are only informing me about this, and he said yes. Three contracts were then migrated from a M+ to a L+. I did not give the authorization to do the migration. After several emails, telephone calls, they say that I agreed to the terms and conditions which they read to me over the phone! I did not, as I specifically asked him, you are just informing me, when he answered, Yes! This is not right! These people have to pay more now every month with no solution from Vodacom's side! My first email to them was on 01/07/2020, Reference number EC-1ZZL-281TCA. second email EC-1Z2I-2E4ZHV. I have also spoken to Veruschka and Reece, and nobody is willing to help. This is what Vodacom does, no joy, only have to pay more and they are not willing to help.