Vodacom data contract is a ****

I took a Vodacom data contract around November 2019 at the Musina Mall. I was told by the consultant that, should I wish to cancel the contract, I would need to pay fee equivalent to a one month premium. I subsequently upgraded the contract in November 2021. Today I wanted to cancel the contract, but to my surprise, I was told to pay R8,491.50. It's such a bizarre thing to ever happen to humankind because this contract didn't involve a device.