Disappointed in Vodacom

Why do you continue sending me invoices for my Vodacom contract which I cancelled on the 26th of April 2025 and settled the account in full? Why should I now pay by the end of May 2025 for a full month if I did not use data or airtime this month + I cancelled the contract for both contract numbers

I also requested Vodacom to keep both contract numbers as prepaid, when I called in yesterday I was said that the number still appears as contract? How is this possible when I got an email stating that the numbers was converted to prepaid and my query has been closed?