Ga Farm Bureau review: Homeowner policy

For the 2nd time in about 8 yearas, my home insurance in wayne county ga has been almost doubled. The last time it was corrected, because a fire house was built within 2 bloccks from my home. My insurance company geargia farm bureau, just out of the blue increased my insurance policy cost by $1000.00 and did not notify me that they were changing my iso rating. Gfb says because a state website says we are 5 miles or more away from a firehouse, we are at the worst iso rating there is. I know for a fact appling county has people 10 miles away from firehouses and they are getting better iso ratings. In our county, we are not the iso rating that the state website, whatever it is, says. Our iso rating shouldnt come from a list somewhere that doesnt know the facts and yet there's nothing we can do about it? Furthermore, gfb should have notified us of a rating change if there was one, before charging an additional $1000. On our policy, just out of the blue it just increased. I found out about it from my mortgage company that I have escrow with, then we get a letter just saying your bill went up.