It is a scam. Do not fall for it. It sounds like it is part of the Nigerian scam bunch. Once they get your email address, phone number etc. you will notifications for winning the lottery, pleas for money, ads for working online, money handling, job offers, etc. They even go so far as to imitate the appearance of certain banks and will send emails telling you to update your account information. These types of scams have been going for years and are increasing, because some foolish people fall for it. It has cost some literally tens of thousands of dollars. Some have purchased plane tickets and went to the destinations expecting to get their prize reward once they got there. Once there they find out the place does not exist, or if it does it has nothing to do with getting some big prize. These types of things are getting huge. BEST advice - is change your email address once they get ahold of it and if they have your telephone number, you might want to consider getting a new number too.
I create dummy email accounts for ordering online even from reputable sources because the email address is sold and then the FLOOD comes with emails for everything and the need to "unsubscribe" when you never subscribed in the first place.