Cancellation of account - deceased person

Hi I have twice notified Telkom that my grandfather passed away in December 2020. I have also sent them a copy of the death certificate and ID to ***. First notice was given on 5th January 2 weeks ago but no response.

One receives no confirmation which is frustrating, I used the live chat function and was told to just check next month to see if the account is closed but they cant even see if my request has been lodged. All I want is some kind of reference as proof of lodging this request as if next month comes round and another account is billed it's too late. Account no ***