Supersonic keeps billing on cancelled accounts

Good day, Kindly see my complaint dated 07/12/2022 https://www.hellopeter.com/supersonic/reviews/supersonic-keeps-billing-cancelled-flte-and-already-returned-router-packages-***

I was called on the same day of that review, and assured the amount billed is credited immediately and i will receive the credit note the end of the month stating the account is now on ZERO. Please note the account has been closed and services has been cancelled in November already, the router has already been returned in november, however there was a bill issued for services on 01/12/2022 - 31/12/2022 that was billed incorrectly. Kindly ensure this bill is cancelled and account is zero'd as I have cancelled it and do not have any supersonic services since November 2022.