Do not invite any unfamiliar salesperson into your home. Such individuals can be very persistent about selling their merchandise, and it is often hard to get them to leave. You are under no obligation to invite them in or make a purchase. You should be very cautious about opening your door to any stranger, particularly in the dark. Use a chain lock for security to see what an unfamiliar person wants, or speak to them through the door without opening it.
Many charitable organizations collect funds door to door.
You are under no obligation to give money to them nor should you invite them in. Do not give unknown callers any personal information such as your name or your home or business address. Be suspicious of callers who claim to be taking a statistical survey of the number and type of appliances, cameras, radios, etc. that you own, or who declare that you have won a prize. Even if the caller identifies himself and sounds legitimate, Do not give out personal information over the phone. Simply hang up if the caller is unpleasant or persistent.