Bungled Upgrade and lack of communication.

I have 2 Data packages from Vodacom, I was contacted in Jan 2021 by someone from Vodacom to upgrade my plan, she assured me that my bill would not increase in fact she said it would be marginally cheaper. My bill in Jan was double! I have tried to contact Vodacom via various means, email, no phones are answered and if so I was cut off. I am highly frustrated! I have never received a copy of said new contract. I would never recommend Vodacom.