Telkom refuses to cancel line and keeps invoicing me!!! **************** and ******ion!!!

I am trying with no success to cancel my telkom line since April 2020 and it's like speaking to a brick wall. They keep apologising but then their accounts department issues an invoice every month. This is first class ******* and ******ion! they need to be reported to the COVID 19 ***** line as this is bordering theft!