Faulty line since 30 June 2017, resident life in danger

We have been using this Telkom line for over 20years we had a good service up until 30 June 2017. The line has been faulty ever since. I constantly phone Telkom every month form 30 June 2017 report the line being faulty, the line will be fixed for a week or then off line again. I have lots of reference that I get every time I report the line. When I asked, what is the problem and how can the problem be fixed permanently. I do not get a response, the answer will be the technical person working has put case resolve, the line work for few days then goes off again. This is an inconvenience and pose high risk to my parents who are pensioners and we rely on the land line to contact them and they rely on the land line as well. Very frustrated client.