Twitter in Portuguese

I just joined Twitter in order to follow some of my fellow Disney maniacs and Cozy Mystery authors. Instead, I keep getting twitters in portuguese from people I do not know, never signed up for, and don't really want. They show as 'following' even if I didn't request it. Every day there are more. I 'unfollow' and 'block' them, but some of them keep coming back. If I have to block them 3 times, I report them for spam. Is there anything else I can do?