Misleading your customers

On 1 October 2018 i called cancellation branch to cancel 2 cellphone contract because they were due for cancellation. I spoke to 1 Patricia and explained to her the reason for my call I even shared with her that I cannot upgrade because i cannot afford those contracts anymore, she suggested that we reduce them to lower airtime and data BUT she never mentioned to me that by reducing to lesser she was doing an upgrade as i had already informed her that i do not want any upgrade because of affordability. In her reducing my package she never informed me that it was going to be a 24 months contract. Suddenly when my account was deducted i was charged more, despite the fact that i couldn't afford them. I have never in my life initiated an upgrade telephonically. I want the upgrade initiated without my consent to be cancelled with immediate effect, yesterday Vodacom promised to listen to the discussion to check if she mentioned upgrade and 24 months contract, i am still waiting. Can this contracts be cancelled urgently because the call centre agent has *****ed and misled me without my consent because i do not do upgrades by phone.