In depth in-person interview, with follow-up calls.
I also remember them complaining that a Census call center was bugging them after 9PM on a Sunday night.
We they told me, I told them that I think ACORN got a contract to do that. Having some knowledge of call centers, I'm guessing that at best, they didn't flag the time zone, and at worst, didn't care.
Yeah they came by daily for about 4 months. They weren’t smart enough to discover my phone #. Because I live outside of town, here in AK I have no mail delivery to my house, and they never sent a notice to my PO Box. So the routine was the same every day: I would drive home and see a car parked down the road. I would drive into my garage and by the time I was in the house the doorbell would ring twice. I would never answer, and they would leave a slip on my front door requesting me to call a phone # and threatening that what I was doing was against the law. I never answered the door, never called the phone #, never removed the notices (I had a bunch of them on my front door), and if they caught me outside I ignored their very existence. Eventually they went away. I am sure as a result I’m on some Gubermint List. But I don’t care.