I had a similar problem several years ago, but fortunately OR after many many attempts at patching our (underground) cables over many years have managed to get an acceptable service (not brilliant, but it does the job). So persistence is necessary in reporting faults which often seems like, all the time.
I was lucky though to have a local commercial WiFi provider. They can supply point to point broadband through the air (in a similar fashion to TV signals - so they need line of sight to their transmitter, and you need to pay for a one-off aerial installation at your premises, as well as the monthly subscription). With the right conditions it's wonderful. No weather impacts. I found my supplier through ISPReview, though Google may be equally as good. They tend to be small local outfits, which has both good and bad aspects so a bit of research is necessary. They do need the backhaul, but aren't dependent on creaking aged infrastructure for the local network. Obviously availability depends on whether you're in a sector with capacity, which depends on transmitter range, obstructions (forests, hills and tall buildings-in-the-way aren't good), and the number of users. So the chances are you're out of luck, but it's worth trying.