Upgrade without my consent

I was constantly contacted by Vodacom (Four Square Group) and Quote sent via e-mail (Quote No: ***. They just went and upgraded the contract without my consent to a more expensive contract and data with No device that I do not need. I have contacted Vodacom on the 2/12/2021 and after along battle about 1.5hrs I was told I will be contacted in 24 to 48 Hrs. I still have not heard anything from Vodacom nor am I able to upgrade to the package I want. I have always had good service but if this is how Vodacom treats there customers they will most certainly leave