I entered a contest to win a free makeover on windows, or siding or roofing. They called to say they had to come out to the house to do an estimate in case we win. I asked for his info & he just gave me a first name & email. Well there is no email for them for me to check them out online. Now I don't feel comfortable with them coming to my home & I need to cancel & noone to cancel too. How do I cancel them coming to my home?