Vodacom ********** calling clients!

Jason Nairj called 04/02/2019 to inform me about the decrease in data rates. I told him I do not want to upgrade my 5 contracts, but he insisted that the call is only for him to give me the benefit of the decrease in rates. I told him again that I do not want to upgrade. He also told me that this is not an upgrade and I will be able to upgrade my contracts at any time I choose. This said, I visited our Vodacom branch and got the sad news that 4 of my contracts have been upgraded for another two years! I want to make a case of *****. How do I go about it? I already tried to get hold of the recording of the transaction, but they forced me to talk to Jason, and he doesnt want to give me the recording unless I talk to him first. He is annoying, as he doesnt care what I have to say. He only wants me to listen to his story all over again. I am beyond furious. Please help me?