Vodacom contracts cancelled, debits continue on my account

I decided not to renew the my phone and wifi contract with Vodacom which expired july 2020. My last debit order was supposed to be 1 August 2020. But they keep on deducting money from my bank account. I don't get invoices anymore seeing that the contracts has stopped. This is unacceptable and pathetic behavior from Vodacom SA. I demand to get refundend for the money they have taken from my account after the contracts were stopped by me.