NOT Cancelling after notice period, continues billing, not collecting router

This is now the second time i write in just one week. I sent in a cancellation email as required for my Fixed LTE uncapped lite @ R499pm on a Month to Month package, on 1/02/2023 via email. To date not a word, I forwarded again, still no word, just automated reply. I see a new Bill has been issued today on 01/03/2023 for the invoice dated today for service 01/03/2023 untill en of March. I have given 30 days notice, and asked at least 30 times to collect the router and simcard from my given adress, but this has still not been done. I will not pay again as i gave my one month notice, and request this router is collected. I need this FULLY CANCELLED IMEDIATELY, and the router collected. Im not paying anything other than the R250 for courrier collection as specified in the terms and conditions, the R499 bill dated 01/03/2023 has to be reversed as this has been cancelled. KINDLY urgently arrange collection of router from my adress I will send privately. Thank YOU.