I wish to know what to do about the spams re winning numbers etc.?

A few month ago, I got a letter from somebody from Pakistan informing me that my email was selected and won a price on their lottery, they ask for so many info and ask me to deposit a certain amount to a given bank account, I didn't mind to response. Again this afternoon I got another one from UK informing me that I am lucky for having won another big amount in pounds, No money has been ask only some personal info about me. Are these lottery legal? please give me some advise . Thank you