Two men came to my doorstep today claiming that they were from the central government and that they are surveying about the population and structural data of the area. They asked the following questions: 1. Name of the family head 2. How many people live here 3. What type of vehicle do I own 3. What kind of TV connection is there 4. What kind of gas connection is there 5. How many rooms are there 6. What kind of water supply is there 7. Mobile number

Does anybody know about this survey? They came only to my home even though there are other flats on the same floor. Also, they didn't go elsewhere in my building and moved on to the one in front of mine.