Account Not cancelled after full notice period and Billing continues.

Not impressed, after i was phoned and promised i will not be getting another bill the end of November, I can confirm I have received INV********** on my cancelled Account S********** - KINDLY urgently ensure the account is fully closed and this bill is cancelled that is issued for service from 01/12/2022 - 31/12/2022 . I gave 30days notice and I made my full payments. Kindly arrange for urgent collection of the router, im liable to only pay R250 for courier collection. I have it ready for collection and service can be terminated as im no longer needing or using it, and legally requested at 30days notice cancellation. I fully paid my bill into a credit of -R1 start of November. I should have only a R250 courier collection bill of the router. Thank you, I do not have the service anymore, i did advise a full month cancellation and was contacted by retentions to provide reasons to cancel, Fixed LTE is billed in advanced, not arrears, my bill was paid up, and should have been cancelled the end of November, kindly URGENTLY have this billing cancelled and credited to ensure account is closed. Thank you