If you do not receive a utility bill, certainly you know something is wrong. However, if you get one which seems about correct, pay it, I feel you have done your part. If the utility messes up, that seems to be their problem. Another thought......are the past charges billed at the rate then, or the current rate? It would be possible for the utility to delibertly underbill customers only to bill them later at a higher rate. Boys and girls, can you spell "ripoff"?