Whoa whoa whoa! Don't like ban or tell them to stop. Sometimes it can be a good thing when someone create's multiple accounts. I've done it on several occasions.
Just do this as a rule, make sure that his first account is very active and has at least 100 posts, after that he can create another character or account. Also if they create another account, they could at the very least try and be original, not the same person posting from a different siggie. Make sure they keep there's active, I had to create a second character on my site, because I like to stay active and I can't be an Admin posting more than my members. So I needed to post as someone else, so I can deal with problems (as admin) and stay on having fun as a member.
Quote:
| he is creating multiple accounts and saying he referred them |
This at the very least should be handled with. He shouldn't be making it like he referred them...thats like a warning, if he continues just take his posting abilities away for a few hours.