Vodacom upgraded my contract without my permission

I was phoned my Vodacom with them pressurising and rudely suggesting I should upgrade my number, I was told I had to upgrade to to able to still use my number and the new contract would be "cheaper"

All of this was obviously a lie and I clearly and repeatedly said NO and then Vodacom upgraded my contract without my permission

Now it's a big struggle to cancel this upgrade which I never said yes to. My contract is more expensive than before and I was charged R300 for the upgrade which again I never said yes to.

Vodacom are *****s and *************. Avoid them at all costs. This is massive *****!