This letter is used to cancel trial versions of magazines or a book club when you don't like it or don't have time to read it. Send this letter along with the bill and on the bill write CANCEL ACCOUNT. This should resolve the issue.
Para su conveniencia, debajo del texto en español le brindamos la versión completa de este formulario en inglés. For your convenience, the complete English version of this form is attached below the Spanish version.