Is there away to make it so someone cant follow me on twitter?

[Hazel]

I recently made a twitter, and I'm totally new to it.
I really only made it so I could follow a few bands/band members just so I knew when upcoming events and things were happening.
But then I got these two followers who seemed to be obvious scams of these girls trying to get people to go to there cam site. I really do not want them following me at all. I blocked them, but it still says they are following me? Can they see my tweets and information?

[The cool one...]

Idk

[Hello]

I know what you mean. Well, they still appear on your followers, they think that they are still following you. They can't see any of your tweets though. Thats good because it says you have 2 extra followers, but really they can't see your tweets at all OR message/ tweet you.
-@cherryybomb_