Impossible to cancel a telkom landline

I have been trying to cancel a landline/adsl since 20 July 2022 after my monther passed away - As executor of the estate, I send 2 e-mails to 2 different addresses (as given by telkom customer service) . no luck. I have been to the telkom store 3x, received confirmation and a case nr from the supervisor that all is sorted. Yet...after all that time again today I am told the line is not cancelled. I keep getting billed. Had a cup of stong coffee this morning, and tried again. Were given 4 different contact numbers - keep runningin circles. Have been on the line for 47 minutes in total. NO ONE CAN ASSIST or the linesimply goes dead after a couple of minutes. How is this possible ????????