Telkom Does not reply to cancelation of deceased account

I sent an email on June 26 to cancel my adsl and land rental services to date. I keep emailing lsdanational@telkom and there hasnt been any reply since. I am trying to avoid being billed for august so i need the last bill to stop. Thr account is on a deceased persons name and needs to stop asap. Telkom does not reply and canceling is a nightmare... i cannot be billed for next month therefore i need immediate cancelation. Very bad service