I called the number back. This is a marketing call from TruGreen Lawn Care Service. I've noticed this problem with TruGreen, they have many employees that do not leave messages, forcing you to call them back or to just accept getting multiple calls. Very frustrating; I'm thinking about switching my service provider or cancelling altogether to avoid being bothered.
Fourth day in a row; these guys do not get the hint. Leave a message and let me call you back; I'm calling and cancelling all of my services to switch to a less invasive company.