HOW TO BYPASS ISP REDIRECT

I'm using Macbook OS X el-capitan, My broadband subscription have ended, i'm not able to use the inteet for a while, all of a sudden my inteet starts working without subscription, but i can only visit google.co.uk, thepiratesbay.se, kat.cr, bypasstuel.com, and i can download torrent using vuze it's not fast sometimes, even now i'm using bypasstuel to access this website, bypasstuel is slow and i can't download using it, unless the file is less than 5mb. all other website will just redirect me to my ISP login page.So my question are 1. why do i access few website? 2. how can i access all other website without going through bypasstuel? 3. how can i bypass my ISP redirection since i can access few website? 4. how can i regain my downloading speed?