Vodacom Contract Cancellation

We sent a mail on the 03 August 2023 to cancel our cellphone contract. Still getting billed every month. Now our cellphones have been suspended because we have not made the last payment. Quering/phoning Vodacom they are escalating and cancelling but nothing happens. Putting us in a situation were we can't make any phone calls or use the phone with data. Escalation has not helped at all. They have received the email but doesn't process. Totally unacceptable we have been customers of Vodacom for almost 20 years.