It will take you months and a fortune to reconstruct your billing system and even when you do, you will battle to recover the significant amounts owed by the customers from calls made in the interim. Because they have not received an account in months, you hear that many people think that they will never have to pay and so are making far more calls than normal. Despite the gas boom, many of your customers are relatively poor and can afford to pay regular small amounts, but will not be able to find a lump sum to meet the large account that they will eventually receive. It will be impossible to sue them all and so you will have to write off a huge amount of the debt.