Vodacom is *****ing my money

Vodacom is taking money out of my bank account after the contract has expired and I sent them emails and made calls giving them instructions to cancel the contract and stop deducting money from my bank account.

I want someone to tell me why they are still deducting my money. I want vodacom to close the stupid account and stop *****ing my money.

I got an email on 30 June 2020 to say my number is now converted to prepaid but still in August they are taking money out of my account, why???