Wanted to know which age category I belonged to. Did I have other people living here with me. Asked was I prepared to answer questions then didn't ask any said he had completed his quota. Fishy

They said doing a research on something but didn't want to entertain further

I had a missed call from this number, they didn't leave a message - as with all calls of this ilk, I just BLOCK the number.
The above comments confirmed I've done the right thing.

They called but did not leave a message.