Vodacon is ripping me off BIG TIME!!!!

Last month after losing my husband to COVID I called Vodacom to cancel our contracts. I paid the full amount of what was provided to me on the cancellation documents for both myself and my late husband. This morning I received a bill from Vodacom stating that I owe R 23k and some change. I called the Customer Car and was told that I have an outstanding R 2500k and some change that will be debited from my account. I asked to speak to cancellation of which the lady never gave her name and proceeded to behave as though I am taking time in her special day. She had and attitude and I wanted to speak with a manager of which magically they are all in meetings. She then placed me on hold and cut the call. Now 1. I am not paying that R 2500.00 and some change because nobody said that I am liable for another debit I was told that there will be no debit on my account this month. 2. If it goes off my account I will be reversing it. I have paid the full cancellation fee and I want someone to call me today regarding this. If my husbands account is debited I will reverse the amount. My number is ***. I will not take this *******.