I have been receiving messages on chat from someone who is using my sons hotmail account.  The message is prompting me to open a pornography site.  I have reported it. What now??

Every day I get messages originating from sackunite.com rodcling.com. These are spam at the very least, some of them are phishing type messages, also maybe pornography. Everytime they appear, I block the sender, report them as junk, as phishing scams, what ever I can think of. When you block messages, a smug not comes up saying thes sender is now blocked that no further messages can be received. This is NOT true. I just get more rubbish from them. Can I do anything to stop them sending me this ****?
I accepted a friend request from someone that I THOUGHT was someone else....well, they're basically sending me pornography, which I DO NOT WANT and I don't know how to delete her! Or him! THE CONTACT! Ive read other answers here, they don't work, it just brings me to a screen with my facebook contacts and  nameless contact. Unless that namess contact is the same as the operson who is sending me pornography, I can't delete a person that isn't in the list! Help, what shoul I do!!!!