Fibre cancellation

I have cancelled our home fibre contract on the 27 May 2020 because we sold our home and moved out on the 1st of June 2020. After numerous emails and call center calls nothing has been done. I have since filed many complaints and spoke to many consultants but again nothing is being done and the bills keep coming! It is now the 11th of August 2020 and i have already received the bill for end of August 2020. WHY!!!!! It seems like there is no way of cancelling a fibre contract. We had the option of getting connected to Vodacom fibre at our new home but with the service we received from Vodacom we decided against it and took a fibre contract from another supplier. My company spends more that R5000 per month at Vodacom for the past 20 years with various contracts but we are now seriously considering changing to another provider. I really don't know what to do anymore!! Is there anyone that can help me please!!!!!!!