So recently my roommates and I received two large bills in quick succession totalling 900$. The first was relatively large given the weather, but it's the second bill that I can't wrap my head around. They claim that they'd been under-evaluating our usage up to this point, and now they're billing us for the difference in one shot. I asked them if it could be paid in increments and they say it's not possible. Am I wrong in thinking this is unfair? Has anybody else dealt with similar problems?