Telkom does not want to cancel landline since 10th April 2021 - today is 11 August 2021

If I could I would not put any star for Telkom. I have cancelled my landline on the 10th of April 2021 as I switched to fibre. I am still getting invoices from Telkom. Icasa has not responded either and the website is not working. (I get URL errors.) I have reference numbers for each mail I sent asking for cancellation. I have sent my ID twice already as requested. Now take note that my April and May bill I paid in full so there should not be any problems as they have had enough notice time to cancel. If there is any one who can assist me with to get this line cancelled... also note that I will not pay for June, July and August as my cancellation was 10th of April. They only require 20 days notice. Reference numbers *** and ***.