What a crock of sh*t by most of your comments. For starters they never called at 9pm because the office is closed well before then. I know because I'm a customer.
NaturaLawn has independently run offices all over the country. Your local office may be closed at 9 PM, however, other offices, whether in Pennsylvania, elsewhere, or elsewhere using a Pennsylvania phone number, may be open and making soliciting phone calls at almost any time of day or night.
I know someone in the Philadelphia area who is also a customer of NaturaLawn but keeps getting calls to purchase their services from this phone number.