Well, I probably won't be around, but I'd say your first step would be to just call them up and talk to them about it. Sometimes you'll get someone who's reasonable and can help you out.
If that doesn't work, you might ask for historical usage data for your apartment. If you can get an idea of how much the bills were the previous year, you should be able to get a decent estimate of whether or not $650 is reasonable. Of course, prices have gone up, so you'll need to keep that in mind, but that should at least let you know how far off they might be.
|