ELITE MOBILE UPGRADE MY ACCOUNT WITHOUT MY KNOWLEDGE

In December 2020, an agent/consultant from Elite Mobile decided to give me an upgrade my account ***)when I had only called to cancel and end the contract with them, I clearly indicated to the agent that I do not want the upgrade. In January I was surprised to receive a bill with an outstanding amount and a huge arrears(+-R3000). I have been calling Elite Mobile from January this year 2021 to date, trying to resolve this issues, every time I call I'm asked to wait while they go to the retention department for help, I spend almost 15 minutes on each call while they take be back and forth. Two weeks ago I was advised that the retention department has resolved the issue and therefore vodacom will never contact me for payments. This morning 01/12/2021 I received an email from vodacom threatening me that an action will be taken against me if I don't make the payment on my account.