Bad admin

In July 2021 Telkom informed me that they no longer have ADSL facilities available and that I have to change my contract. I changed it to a fibre line. Since then I am receiving 2 invoices per month, 1 for the old ADSL line (Acc *** ) and 1 for the new Fibre line (Acc ***). When they came to install the Fibre line, they took the old router. I pay the fibre invoice every month, and reply every month on the ADSL invoice that this contract has been changed to a fibre contract. Today I got a final notice from Telkom regarding this. Can you please get your admin up to date and cancel the ADSL contract as from July 2021.