Who called from 6474975801

Market research company asking questions about my neighbourhood

Really, market research at 8 am in the morning asking very detailed questions about the neighbourhood.  Almost like they are trying to case the area.

Received two calls, but when I go to pick it up, they hang up.

They were going to ask 3 questions about my neighbourhood.  I hung up, they didn't call back.

Called at 8 AM. When I picked and said hello I heard a guy saying "hello?..Hello? ..I can't hear you well, let me give you call back." and then they hang up. I would have fallen for it if it hadn't been the third time in a few months: same voice, same excuse and doesn't call back.
Wonder why anyone would do that and put a recording like that.