Vodacom ******* Contract Upgrades

I want to cancel my contract which I took out many years ago with Vodacom. When I want to cancel they tell me I cant because I apparently upgraded in September. I most definitely did not agree to any upgrade and did not receive a new device and when I ask for proof that I did, they pass me around departments without anyone actually being able to commit to provide proof, eventually just being hung up on.

How can you upgrade clients with 24 month contracts without them agreeing to it and without proof on hand that they did or did not???

I am still waiting for someone to give me proof of this alleged upgrade.

For the premium price you pay to be with Vodacom, this is disgusting customer service and a legal issue of ******* upgrades.