How can I report spam when I can't get spam to follow me?

I keep getting followed by porn and spam sites. Each time I have blocked them, they show right back up. One girl is topless playing with herself. I have blocked her 3 times from the same name. luoxuegui was the most recent, and showed right back up after i blocked them by changing just one letter. It says I can't dm spam until they follow me and I can only report spam by dming them. HELP