It's not a lie, it's a market survey, mainly to do some street interviews or mysterious guest surveys. Market research usually recruits many part-time interviewers, because their work is determined according to the project. Usually there are more weekends, and there is nothing to do from Tuesday to Thursday. If you are a student, it's good to work part-time there. If you are full-time, you need some experience. My previous company cooperated with this company. Don't worry, it's absolutely formal.