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@Amakangaroo you need to apply for Medical Priority Assist for starters. This flags you in the system so that your service gets priority (as much as it can in the days of NBN) when needs repairs.
At the very least, it can help reduce the amount of time that you are without a phone service.
You should also lodge your problem as a formal complaint via https://telstra.com/complaints
That way, it can be dealt with via a single point of contact, rather than having to deal with a different person each time.
Unfortunately, on the internet side of things, there isn't a great deal that can be done as it is dependant on the infrastructure in the area.
You could put your address into the tower locator at http://rfnsa.com.au and see what infrastructure is around you, as there might be a tower for a different company that gives better reception. You could then get a cheap Prepaid SIM and test it out.