Vodacom initiating contract when asked to cancel a number.

I had a cell number for my mom under my name. I did not renew her contract as she was ill and would not outlive a new contract. She passed away in July 2022. I immediately requested that her number be cancelled. A few months ago I received a call from vodacom regarding an upgrade for her number. I advised that I cancelled the number. It shows on their records as such. Vodacom never cancelled the number, but took it upon themselves to take out a data contract for R30 per month to keep her line open. When I was contacted recently about upgrading, I was shocked and asked them again to cancel the number. I received another call just now to advise that there is a 30 day penalty to cancel the so called contract, which I never took out! In plain words, this is *****. My statement only reflects my total value, so I would not notice. I have been a client of Vodacom since the forst cell phones were launched. The only explanation I have is that consultants are taking out contracts unbeknown to us. I will be moving all business to a new vendor. Three different calls and no action. Vodacom, I am very disappointed. I am sure that I am not the only one.