Dear Amthul ,

This matter entirely depends on the institution where you are currently pursuing your academics. Many college take charges from students for e-books and some colleges let students to avail e-books for free. The link of such e-books are shared through mail from college or in official what's app group. Since you have not yet received the e-books from your college keep the transaction slip intact, produce it to the college and ask when will you get your e-books. Hope this helps.