Brian Jacques 
RSB Limited (Storycuts) [EPUB ebook] 

When Jonathan joins a new school, he is an easy target for R.S.B. Limited, three bullies who demand money in exchange for 'protection.’ Unable to afford the rates, he is subjected to a humiliating daily ritual. However, a pale anonymous boy who looks eerily similar to Jonathan has been glimpsed around the school – and he’s not going to let R.S.B. Limited get away with their bullying any more. Part of the Stroycuts series, this short story was previously published in the collection Seven Strange and Ghostly Tales.