Service Failure

My father passed away 2 years ago. We contacted telkom regarding the land-line that was in his name that they keep billing for. We offered to send the death certificate and leave the phone at a telkom store. They gave us a reference and said we would get a call advising of further instructions. To date we have not received a call and we are still being billed. This is beyond disrespectful and bad service. Telkom has a long way to go. Can a service provider have no empathy or professionalism yes telkom certainly takes the cake. Can they not see the person is deceased.