Unfair business practice

I wrote a review about the bad service by vodacom, I have been their customer for more than 20years.after canceling my contract one of the consultant decided to do an upgrade which I didn't approve, Vodacom has to listen to the recordings and get that consultant to pay what they say I owe them, because I never signed for an upgrade, the reason for the contract cancellation is because I am trying to cut and downgrade my life because of the economy that keeps on going high. I am still waiting for a call to fix this matter.