Unauthorised upgrades to 3 contracts

Vodacom at it's worst. Got a call on 16th Jan to offer me an upgrade on one of my 3 contracts. I stated 3 times that I didn't want to extend the data contract, and when I called customer care the following day, I was informed that all 3 of my contracts had been upgraded. I immediately tried getting hold of the after sales team, which I was advised to do, what a mission, and no assistance there! Emailed customer care, waste of time, no response from them either! So what am I meant to do now? I have been a customer for well over 20 years, and am now completely and totally disgusted with Vodacom. How DARE they upgrade 3 contracts without my permission. Will be seeing a lawyer about this ********** behaviour.