While I hear your pain, I must point out that you mentioned that they tried
to come get their equipment back. I don't doubt the service sucks one bit, but boy oh boy it sounds like you're keeping their blood pressure going.
Do you have 3g (or 4g) out by you yet? If you haven't tried mobile broadband it's worth a shot. When I was in a similar bind I ended up just grabbing a decent aircard and EVDO Rev A or so brought ~100ms ping times and a few mbit down. Combined that with Sat TV & the regular cell phone and I was good to go. A friend in that same area is still on the same setup using a Sprint hotspot device. Beats the speeds you seem to be getting.--
Baka wa shinanakya naoranai