it makes me wonder, do they actually listen to the opening things when calling
As FoxPaws said, they don't. Right now my work number is 2 digits switched (429 vs. 492) from a local glass business. We're a technology company. I answer my phone "Thanks you for calling My Technology Company, this is o_gal" and they launch right into conversation with what they think is the glass company.
And then they don't even listen as you continue the call. I've posted this in the past in some other thread here, but I worked in college for a short stint as a receptionist. We were a pharmaceutical testing company, doing efficacy studies as part of FDA studies for new drugs or generics. One day I got this call:
Me: Thank you for calling Biodecision Laboratories, how may I direct your call?
Caller: Uhhhhhh, I need to speak with <name>.
Me: (I don't recognize the name, it's not someone in the admin section, could be someone upstairs) Do you know which division <name> works in? Could they be in the lab or the clinic?
Caller: Maybe, I don't know.
Me: OK, I'll try the lab (I ring up there and no, there are no techs by that name)
Me: Could the person be in the clinic, because we do not have any lab techs by that name.
Calller: Maybe, I don't know.
Me: (right up the clinic, no clinicians by that name and no study subjects)
Me: I'm sorry, I'm really going to need you to give me some more info on why you need to reach this person.
Caller: They were going to put together some TripTiks for me.
Yes, our number was 1 digit off from AAA.