When I called the number back, I went in queue for a call center. The rep stated that they called me looking for someone called Monica, something to do with "$100 Surveys". The name of the company was a website/domain name, and this is apparently a paid-for research company.
Rep was polite and said she'd take me off their list. Didn't try to get me to use their services or anything. Remains to be seen if they'll stop calling.