I have a customer who hasn't paid last months bill plus half of this months. She's a new one, so I don't really know her well. Anyway, I tried to get a hold of her, knocked on her door twice but no answer(cars WERE there). The bill was for 125.00, and now it is up to 175.00, not that much, but enough to scare me. I am trying to come up with a registered letter to send out tomorrow. Any suggestions, or attachtment of ones that you use would help out tremendously.