is it normal practice for a service tech to lie about showing up?

Hi, I'm just curious if anyone has had an issue with a service tech lying about fulfilling an appointment.  After my time window expired, I inquired why the tech wasn't here, and was told that he called and knocked on the door to no answer.

I have no phone calls, especially none at the time I was told he "called", and i reviewed camera footage from my front door showing absolutely no one for two hours prior to the service window, and no one during the time of the service window.  That's a very dissatisfying feeling that a service tech would falsify information about attempting a visit when i have irrefutable proof that no one came to the door.